blocks|key|2941636|text|$str+=+'In+My+Cart+:+11+12+items';
preg_match_all('!\d%2B!',+$str,+$matches);
print_r($matches);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|2941637|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>$str = 'In My Cart : 11 12 items';
preg_match_all('!\d+!', $str, $matches);
print_r($matches);
</code></pre>

blocks|key|2656624|text|您可以使用preg_match|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2656625|$s+=+"In+My+Cart+:+11+items";
preg_match("%7C\d%2B%7C",+$s,+$m);
var_dump($m);|code-block|syntax|javascript|2656626|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/preg_match^0|5|A|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

You can use <a href="http://php.net/preg_match" rel="noreferrer">preg_match</a>:

<pre><code>$s = "In My Cart : 11 items";
preg_match("|\d+|", $s, $m);
var_dump($m);
</code></pre>

blocks|key|2941694|text|如果您只想过滤掉除数字之外的所有内容，最简单的方法是使用filter_var|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2941695|$str+=+'In+My+Cart+:+11+items';
$int+=+(int)+filter_var($str,+FILTER_SANITIZE_NUMBER_INT);|code-block|syntax|javascript|2941696|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/filter_var^0|S|A|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

If you just want to filter everything other than the numbers out, the easiest is to use <a href="http://php.net/filter_var" rel="noreferrer">filter_var</a>:

<pre><code>$str = 'In My Cart : 11 items';
$int = (int) filter_var($str, FILTER_SANITIZE_NUMBER_INT);
</code></pre>

blocks|key|2941708|text|preg_replace('/[%5E0-9]/',+'',+$string);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|2941709|这应该会做得更好！|unstyled|2941710|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>preg_replace('/[^0-9]/', '', $string);
</code></pre>

This should do better job!...

blocks|key|2941719|text|使用preg_replace|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2941720|$str+=+'In+My+Cart+:+11+12+items';
$str+=+preg_replace('/\D/',+'',+$str);
echo+$str;|code-block|syntax|javascript|2941721|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/function.preg-replace.php^0|2|C|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

Using <a href="http://php.net/manual/en/function.preg-replace.php">preg_replace</a>

<pre><code>$str = 'In My Cart : 11 12 items';
$str = preg_replace('/\D/', '', $str);
echo $str;
</code></pre>

blocks|key|4730326|text|对于浮点数，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4730327|preg_match_all('!\d%2B\.?\d%2B!',+$string+,$match);|code-block|syntax|javascript|4730328|谢谢你指出这个错误。@mickmackusa|4730329|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

For floating numbers,

<pre><code>preg_match_all('!\d+\.?\d+!', $string ,$match);
</code></pre>

Thanks for pointing out the mistake. @mickmackusa

blocks|key|4730362|text|您可以使用以下函数：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4730363|function+extract_numbers($string)
{
+++preg_match_all('/([\d]%2B)/',+$string,+$match);

+++return+$match[0];
}|code-block|syntax|javascript|4730364|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can use following function: 

<pre><code>function extract_numbers($string)
{
 preg_match_all('/([\d]+)/', $string, $match);

 return $match[0];
}
</code></pre>

blocks|key|2656753|text|使用preg_replace|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2656754|$str+=+'(111)+111-1111';
$str+=+preg_replace('/\D/',+'',+$str);
echo+$str;|code-block|syntax|javascript|2656755|输出:+1111111111|2656756|entityMap^0|2|C|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

Using <code>preg_replace</code>:

<pre><code>$str = '(111) 111-1111';
$str = preg_replace('/\D/', '', $str);
echo $str;
</code></pre>

Output: 1111111111

blocks|key|4730416|text|这并不是我的功劳，但我只需要分享它。此正则表达式将从字符串中获取数字，包括小数点/位以及逗号：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4730417|/((?:[0-9]%2B,)*[0-9]%2B(?:\.[0-9]%2B)?)/|offset|length|style|CODE|4730418|从这里引出：|4730419|php+-+regex+-+how+to+extract+a+number+with+decimal+(dot+and+comma)+from+a+string+(e.g.+1,120.01)?|4730420|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/14482022/php-regex-how-to-extract-a-number-with-decimal-dot-and-comma-from-a-string#answer-14482071^0|0|0|Z|0|0|0|2P|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@$D|V|E|W|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|X|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|Y|8|@]|9|@$D|Z|E|10|1|11]]|A|$]]|$1|L|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S]]]]

I do not own the credit for this, but I just have to share it. This regex will get numbers from a string, including decimal points/places, as well as commas:

<code>/((?:[0-9]+,)*[0-9]+(?:\.[0-9]+)?)/</code>

Cited from here: 
<a href="https://stackoverflow.com/questions/14482022/php-regex-how-to-extract-a-number-with-decimal-dot-and-comma-from-a-string#answer-14482071">php - regex - how to extract a number with decimal (dot and comma) from a string (e.g. 1,120.01)?</a>

blocks|key|2656839|text|preg_match_all('!\d%2B!',+$some_string,+$matches);
$string_of_numbers+=+implode('+',+$matches[0]);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|2656840|在这种特定情况下，内爆中的第一个参数是“用一个空格分隔匹配中的每个元素”。内爆不会在第一个数字之前或最后一个数字之后放一个空格(或者不管你的第一个参数是什么)。|unstyled|2656841|另外需要注意的是，$matches是存储找到的匹配数组(与此正则表达式匹配的数组)的位置。|2656842|有关数组中其他索引的进一步说明，请参阅：http://php.net/manual/en/function.preg-match-all.php|offset|length|2656843|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/function.preg-match-all.php^0|0|0|0|K|1G|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|V|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|F|7|X|8|@]|9|@$K|Y|L|Z|1|10]]|A|$]]|$1|M|3|-4|5|F|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

<pre><code>preg_match_all('!\d+!', $some_string, $matches);
$string_of_numbers = implode(' ', $matches[0]);
</code></pre>

The first argument in implode in this specific case says "separate each element in matches[0] with a single space." Implode will not put a space (or whatever your first argument is) before the first number or after the last number.

Something else to note is $matches[0] is where the array of matches (that match this regular expression) found are stored. 

For further clarification on what the other indexes in the array are for see: <a href="http://php.net/manual/en/function.preg-match-all.php" rel="nofollow">http://php.net/manual/en/function.preg-match-all.php</a>

blocks|key|2656865|text|试试这个，使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2656866|$string+=+"Hello!+123+test+this?+456.+done?+100%25";
$int+=+intval(preg_replace('/[%5E0-9]%2B/',+'',+$string),+10);
echo+$int;|code-block|syntax|javascript|2656867|2656868|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|K|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|L|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|M|8|@]|9|@]|A|$]]]|I|$]]

try this,use <a href="http://php.net/manual/en/function.preg-replace.php" rel="nofollow">preg_replace</a>

<pre><code>$string = "Hello! 123 test this? 456. done? 100%";
$int = intval(preg_replace('/[^0-9]+/', '', $string), 10);
echo $int;
</code></pre>

<a href="https://3v4l.org/aObYp" rel="nofollow">DEMO</a>

blocks|key|1040131|text|根据您的用例，这也可能是一种选择：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1040132|$str+=+'In+My+Cart+:+11+items';
$num+=+'';

for+($i+=+0;+$i+<+strlen($str);+$i%2B%2B)+{

++++if+(is_numeric($str[$i]))+{
++++++++$num+.=+$str[$i];
++++}
}

echo+$num;+//+11|code-block|syntax|javascript|1040133|尽管我同意正则表达式或filter_var()在上述情况下会更有用。|offset|length|style|CODE|1040134|entityMap^0|0|0|B|C|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Depending on your use case, this might also be an option:

<pre><code>$str = 'In My Cart : 11 items';
$num = '';

for ($i = 0; $i &lt; strlen($str); $i++) {

 if (is_numeric($str[$i])) {
 $num .= $str[$i];
 }
}

echo $num; // 11
</code></pre>

Though I'd agree a regex or <code>filter_var()</code> would be more useful in the stated case.

blocks|key|2656908|text|对于utf8字符串：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2656909|function+unicodeStrDigits($str)+{
++++$arr+=+array();
++++$sub+=+'';
++++for+($i+=+0;+$i+<+strlen($str);+$i%2B%2B)+{+
++++++++if+(is_numeric($str[$i]))+{
++++++++++++$sub+.=+$str[$i];
++++++++++++continue;
++++++++}+else+{
++++++++++++if+($sub)+{
++++++++++++++++array_push($arr,+$sub);
++++++++++++++++$sub+=+'';
++++++++++++}
++++++++}
++++}

++++if+($sub)+{
++++++++array_push($arr,+$sub);+
++++}

++++return+$arr;
}|code-block|syntax|javascript|2656910|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

for utf8 str:

<pre><code>function unicodeStrDigits($str) {
 $arr = array();
 $sub = '';
 for ($i = 0; $i &lt; strlen($str); $i++) { 
 if (is_numeric($str[$i])) {
 $sub .= $str[$i];
 continue;
 } else {
 if ($sub) {
 array_push($arr, $sub);
 $sub = '';
 }
 }
 }

 if ($sub) {
 array_push($arr, $sub); 
 }

 return $arr;
}
</code></pre>

blocks|key|4730531|text|其他方式(甚至是unicode字符串)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4730532|$res+=+array();
$str+=+'test+1234+555+2.7+string+.....+2.2+3.3';
$str+=+preg_replace("/[%5E0-9\.]/",+"+",+$str);
$str+=+trim(preg_replace('/\s%2B/u',+'+',+$str));
$arr+=+explode('+',+$str);
for+($i+=+0;+$i+<+count($arr);+$i%2B%2B)+{
++++if+(is_numeric($arr[$i]))+{
++++++++$res[]+=+$arr[$i];
++++}
}
print_r($res);+//Array+(+[0]+=>+1234+[1]+=>+555+[2]+=>+2.7+[3]+=>+2.2+[4]+=>+3.3+)+|code-block|syntax|javascript|4730533|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

other way(unicode string even):

<pre><code>$res = array();
$str = 'test 1234 555 2.7 string ..... 2.2 3.3';
$str = preg_replace("/[^0-9\.]/", " ", $str);
$str = trim(preg_replace('/\s+/u', ' ', $str));
$arr = explode(' ', $str);
for ($i = 0; $i &lt; count($arr); $i++) {
 if (is_numeric($arr[$i])) {
 $res[] = $arr[$i];
 }
}
print_r($res); //Array ( [0] =&gt; 1234 [1] =&gt; 555 [2] =&gt; 2.7 [3] =&gt; 2.2 [4] =&gt; 3.3 ) 
</code></pre>

blocks|key|2656941|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2656942|如果你不知道数字是哪种格式？整型或浮点型，则使用以下命令：|blockquote|2656943|2656944|2656945|$string+=+'$125.22';

$string2+=+'$125';

preg_match_all('/(\d%2B.?\d%2B)/',$string,$matches);+//+$matches[1]+=+125.22

preg_match_all('/(\d%2B.?\d%2B)/',$string2,$matches);+//+$matches[1]+=+125|code-block|syntax|javascript|2656946|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|-4|4|5|6|M|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|N|7|@]|8|@]|9|$]]|$1|D|3|-4|4|5|6|O|7|@]|8|@]|9|$]]|$1|E|3|-4|4|5|6|P|7|@]|8|@]|9|$]]|$1|F|3|G|4|H|6|Q|7|@]|8|@]|9|$I|J]]|$1|K|3|-4|4|5|6|R|7|@]|8|@]|9|$]]]|L|$]]

<blockquote>
 If you don't know which format the number is? int or floating, then use this :
</blockquote>

<pre><code>$string = '$125.22';

$string2 = '$125';

preg_match_all('/(\d+.?\d+)/',$string,$matches); // $matches[1] = 125.22

preg_match_all('/(\d+.?\d+)/',$string2,$matches); // $matches[1] = 125
</code></pre>

blocks|key|2941998|text|此函数还将处理浮点数|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2941999|$str+=+"Doughnuts,+4;+doughnuts+holes,+0.08;+glue,+3.4";
$str+=+preg_replace('/[%5E0-9\.]/','-',+$str);
$str+=+preg_replace('/(\-%2B)(\.\.%2B)/','-',+$str);
$str+=+trim($str,+'-');
$arr+=+explode('-',+$str);|code-block|syntax|javascript|2942000|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This functions will also handle the floating numbers

<pre><code>$str = "Doughnuts, 4; doughnuts holes, 0.08; glue, 3.4";
$str = preg_replace('/[^0-9\.]/','-', $str);
$str = preg_replace('/(\-+)(\.\.+)/','-', $str);
$str = trim($str, '-');
$arr = explode('-', $str);
</code></pre>

blocks|key|2942028|text|$value+=+'25%25';|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|2942029|或|unstyled|2942030|$value+=+'25.025$';|2942031|2942032|$value+=+'I+am+numeric+25';
$onlyNumeric+=+filter_var($value,+FILTER_SANITIZE_NUMBER_FLOAT,+FILTER_FLAG_ALLOW_FRACTION);|2942033|这将仅返回数值|2942034|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|R|8|@]|9|@]|A|$B|C]]|$1|I|3|E|5|F|7|S|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|T|8|@]|9|@]|A|$B|C]]|$1|L|3|M|5|F|7|U|8|@]|9|@]|A|$]]|$1|N|3|-4|5|F|7|V|8|@]|9|@]|A|$]]]|O|$]]

<pre><code>$value = '25%';
</code></pre>

Or

<pre><code>$value = '25.025$';
</code></pre>

Or

<pre><code>$value = 'I am numeric 25';
$onlyNumeric = filter_var($value, FILTER_SANITIZE_NUMBER_FLOAT, FILTER_FLAG_ALLOW_FRACTION);
</code></pre>

This will return only the numeric value

blocks|key|2942049|text|我们可以像这样从其中提取int|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2942050|$string+=+'In+My+Car_Price+:+50660.00';

echo+intval(preg_replace('/[%5E0-9.]/','',$string));++#+without+number+format+++output:+50660
echo+number_format(intval(preg_replace('/[%5E0-9.]/','',$string)));++#+with+number+format++output+:50,660|code-block|syntax|javascript|2942051|演示：http://sandbox.onlinephpfunctions.com/code/82d58b5983e85a0022a99882c7d0de90825aa398|offset|length|2942052|entityMap|0|LINK|mutability|MUTABLE|url|http://sandbox.onlinephpfunctions.com/code/82d58b5983e85a0022a99882c7d0de90825aa398^0|0|0|3|2B|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

we can extract int from it like 

<pre><code>$string = 'In My Car_Price : 50660.00';

echo intval(preg_replace('/[^0-9.]/','',$string)); # without number format output: 50660
echo number_format(intval(preg_replace('/[^0-9.]/','',$string))); # with number format output :50,660
</code></pre>

demo : <a href="http://sandbox.onlinephpfunctions.com/code/82d58b5983e85a0022a99882c7d0de90825aa398" rel="nofollow noreferrer">http://sandbox.onlinephpfunctions.com/code/82d58b5983e85a0022a99882c7d0de90825aa398</a>

blocks|key|2657051|text|按照这一步，它会将字符串转换为数字|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2657052|$value+=+'$0025.123';
$onlyNumeric+=+filter_var($value,+FILTER_SANITIZE_NUMBER_FLOAT,+FILTER_FLAG_ALLOW_FRACTION);
settype($onlyNumeric,"float");

$result=($onlyNumeric%2B100);
echo+$result;|code-block|syntax|javascript|2657053|另一种方法是：|2657054|$res+=+preg_replace("/[%5E0-9.]/",+"",+"$15645623.095605659");|2657055|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Follow this step it will convert string to number

<pre><code>$value = '$0025.123';
$onlyNumeric = filter_var($value, FILTER_SANITIZE_NUMBER_FLOAT, FILTER_FLAG_ALLOW_FRACTION);
settype($onlyNumeric,"float");

$result=($onlyNumeric+100);
echo $result;
</code></pre>

Another way to do it :

<pre><code>$res = preg_replace("/[^0-9.]/", "", "$15645623.095605659");
</code></pre>

blocks|key|4730686|text|此脚本首先创建一个文件，将数字写入一行，如果获取的字符不是数字，则更改为下一行。最后，它再次将数字排序到一个列表中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4730687|string1+=+"hello+my+name+12+is+after+198765436281094and14+and+124de"
f=+open("created_file.txt","w%2B")
for+a+in+string1:
++++if+a+in+['1','2','3','4','5','6','7','8','9','0']:
++++++++f.write(a)
++++else:
++++++++f.write("\n"+%2Ba%2B+"\n")
f.close()


#desired_numbers=[x+for+x+in+open("created_file.txt")]

#print(desired_numbers)

k=open("created_file.txt","r")
desired_numbers=[]
for+x+in+k:
++++l=x.rstrip()
++++print(len(l))
++++if+len(l)==15:
++++++++desired_numbers.append(l)


#desired_numbers=[x+for+x+in+k+if+len(x)==16]
print(desired_numbers)|code-block|syntax|javascript|4730688|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This script creates a file at first , write numbers to a line and changes to a next line if gets a character other than number. At last, again it sorts out the numbers to a list.

<pre><code>string1 = "hello my name 12 is after 198765436281094and14 and 124de"
f= open("created_file.txt","w+")
for a in string1:
 if a in ['1','2','3','4','5','6','7','8','9','0']:
 f.write(a)
 else:
 f.write("\n" +a+ "\n")
f.close()


#desired_numbers=[x for x in open("created_file.txt")]

#print(desired_numbers)

k=open("created_file.txt","r")
desired_numbers=[]
for x in k:
 l=x.rstrip()
 print(len(l))
 if len(l)==15:
 desired_numbers.append(l)


#desired_numbers=[x for x in k if len(x)==16]
print(desired_numbers)
</code></pre>

blocks|key|2657094|text|因为在您的字符串中只有一个要隔离的数值，所以我支持并亲自将filter_var()与FILTER_SANITIZE_NUMBER_INT一起使用。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2657095|echo+filter_var($string,+FILTER_SANITIZE_NUMBER_INT);|code-block|syntax|javascript|2657096|一种奇怪的技术是使用带有字符掩码的ltrim()，然后将剩余的字符串转换为整数。这是因为只有一个数值，并且整数之前的字符是字母数字、冒号或空格。|2657097|Demo|2657098|$string+=+"In+My+Cart+:+11+items";
echo+(int)ltrim($string,+'A..z:+');
//+11|2657099|2657100|如果由于某种原因有多个整数值，并且您想要获取第一个整数值，那么regex将是一种直接的技术。|2657101|2657102|echo+preg_match('/\d%2B/',+$string,+$m)+?+$m[0]+:+'';|2657103|entityMap|0|LINK|mutability|MUTABLE|url|https://3v4l.org/Q8fdP|1|https://3v4l.org/BKjKL^0|T|C|16|Q|0|0|H|7|0|0|4|0|0|0|0|0|0|4|1|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@$9|17|A|18|B|C]|$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|1B|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|1C|8|@$9|1D|A|1E|B|C]]|D|@]|E|$]]|$1|M|3|N|5|6|7|1F|8|@]|D|@$9|1G|A|1H|1|1I]]|E|$]]|$1|O|3|P|5|H|7|1J|8|@]|D|@]|E|$I|J]]|$1|Q|3|-4|5|6|7|1K|8|@]|D|@]|E|$]]|$1|R|3|S|5|6|7|1L|8|@]|D|@]|E|$]]|$1|T|3|N|5|6|7|1M|8|@]|D|@$9|1N|A|1O|1|1P]]|E|$]]|$1|U|3|V|5|H|7|1Q|8|@]|D|@]|E|$I|J]]|$1|W|3|-4|5|6|7|1R|8|@]|D|@]|E|$]]]|X|$Y|$5|Z|10|11|E|$12|13]]|14|$5|Z|10|11|E|$12|15]]]]

Since there is only 1 numeric value to isolate in your string, I would endorse and personally use <code>filter_var()</code> with <code>FILTER_SANITIZE_NUMBER_INT</code>.
<pre><code>echo filter_var($string, FILTER_SANITIZE_NUMBER_INT);
</code></pre>
A whackier technique which works because there is only 1 numeric value AND the only characters that come before the integer are alphanumeric, colon, or spaces is to use <code>ltrim()</code> with a character mask then cast the remaining string as an integer.
<a href="https://3v4l.org/Q8fdP" rel="nofollow noreferrer">Demo</a>
<pre><code>$string = &quot;In My Cart : 11 items&quot;;
echo (int)ltrim($string, 'A..z: ');
// 11
</code></pre>
<hr />
If for some reason there was more than one integer value and you wanted to grab the first one, then regex would be a direct technique.
<a href="https://3v4l.org/BKjKL" rel="nofollow noreferrer">Demo</a>
<pre><code>echo preg_match('/\d+/', $string, $m) ? $m[0] : '';
</code></pre>

blocks|key|1040358|text|使用sscanf的替代解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1040359|$str+=+"In+My+Cart+:+11+items";
list($count)+=+sscanf($str,+'In+My+Cart+:+%25s+items');|code-block|syntax|javascript|1040360|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

An alternative solution with sscanf:
<pre><code>$str = &quot;In My Cart : 11 items&quot;;
list($count) = sscanf($str, 'In My Cart : %s items');
</code></pre>

blocks|key|1040411|text|顶级资源友好解决方案|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1040412|<?php
++++var+$string+=+"In+My+Cart+:+11+items";
?>|code-block|syntax|javascript|1040413|1.最快：filter_var+-使用指定的过滤器过滤变量|CODE|1040414|<?php
++++filter_var($string,+FILTER_SANITIZE_NUMBER_INT);+//+string(2)+"11"
?>|1040415|2.几乎最快的：str_replace+-将所有出现的搜索字符串替换为替换字符串|1040416|<?php
++++str_replace(array('In+My+Cart+:+','+item',+'s'),"",+$string);+//+string(2)+"11"
?>|1040417|3.足够快：preg_replace+-执行正则表达式搜索和替换|1040418|<?php
++++preg_replace("/[%5E0-9]/","",$string);+//+string(2)+"11"
?>|1040419|然而，|1040420|使用cases|1040421|preg_replace或filter_var|unordered-list-item|1040422|
|1040423|instead可以使用函数来指定要替换的内容使用preg_replace_callback|1040424|1040425|with+preg_replace_callback可以在一个call|1040426|1040427|filter_var中进行多个替换在sanitation+options|1040428|
中受到限制|1040429|entityMap|0|LINK|mutability|MUTABLE|url|https://www.php.net/manual/en/function.filter-var.php|1|https://www.php.net/manual/en/function.str-replace.php|2|https://www.php.net/manual/en/function.preg-replace.php|3|https://www.php.net/manual/en/function.preg-replace-callback|4|https://www.php.net/manual/en/function.filter-var.php#refsect1-function.filter-var-parameters^0|2|8|0|0|5|A|5|A|0|0|0|8|B|8|B|1|0|0|6|C|6|C|2|0|0|0|0|0|C|D|A|0|0|O|L|O|L|3|0|0|5|L|0|0|0|A|I|I|4|0|0^^$0|@$1|2|3|4|5|6|7|1W|8|@$9|1X|A|1Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|1Z|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|20|8|@$9|21|A|22|B|M]]|D|@$9|23|A|24|1|25]]|E|$]]|$1|N|3|O|5|H|7|26|8|@]|D|@]|E|$I|J]]|$1|P|3|Q|5|6|7|27|8|@$9|28|A|29|B|M]]|D|@$9|2A|A|2B|1|2C]]|E|$]]|$1|R|3|S|5|H|7|2D|8|@]|D|@]|E|$I|J]]|$1|T|3|U|5|6|7|2E|8|@$9|2F|A|2G|B|M]]|D|@$9|2H|A|2I|1|2J]]|E|$]]|$1|V|3|W|5|H|7|2K|8|@]|D|@]|E|$I|J]]|$1|X|3|Y|5|6|7|2L|8|@]|D|@]|E|$]]|$1|Z|3|10|5|6|7|2M|8|@]|D|@]|E|$]]|$1|11|3|12|5|13|7|2N|8|@$9|2O|A|2P|B|M]|$9|2Q|A|2R|B|M]]|D|@]|E|$]]|$1|14|3|15|5|6|7|2S|8|@]|D|@]|E|$]]|$1|16|3|17|5|13|7|2T|8|@$9|2U|A|2V|B|M]]|D|@$9|2W|A|2X|1|2Y]]|E|$]]|$1|18|3|15|5|6|7|2Z|8|@]|D|@]|E|$]]|$1|19|3|1A|5|13|7|30|8|@$9|31|A|32|B|M]]|D|@]|E|$]]|$1|1B|3|15|5|6|7|33|8|@]|D|@]|E|$]]|$1|1C|3|1D|5|13|7|34|8|@$9|35|A|36|B|M]]|D|@$9|37|A|38|1|39]]|E|$]]|$1|1E|3|1F|5|6|7|3A|8|@]|D|@]|E|$]]|$1|1G|3|-4|5|6|7|3B|8|@]|D|@]|E|$]]]|1H|$1I|$5|1J|1K|1L|E|$1M|1N]]|1O|$5|1J|1K|1L|E|$1M|1P]]|1Q|$5|1J|1K|1L|E|$1M|1R]]|1S|$5|1J|1K|1L|E|$1M|1T]]|1U|$5|1J|1K|1L|E|$1M|1V]]]]

<h2>The top resource-friendly solutions</h2>
<pre><code>&lt;?php
 var $string = &quot;In My Cart : 11 items&quot;;
?&gt;
</code></pre>
<h3>1. Fastest: <a href="https://www.php.net/manual/en/function.filter-var.php" rel="nofollow noreferrer"><code>filter_var</code></a> — Filters a variable with a specified filter</h3>
<pre><code>&lt;?php
 filter_var($string, FILTER_SANITIZE_NUMBER_INT); // string(2) &quot;11&quot;
?&gt;
</code></pre>
<h3>2. Almost the fastest: <a href="https://www.php.net/manual/en/function.str-replace.php" rel="nofollow noreferrer"><code>str_replace</code></a> — Replace all occurrences of the search string with the replacement string</h3>
<pre><code>&lt;?php
 str_replace(array('In My Cart : ',' item', 's'),&quot;&quot;, $string); // string(2) &quot;11&quot;
?&gt;
</code></pre>
<h3>3. Fast enough: <a href="https://www.php.net/manual/en/function.preg-replace.php" rel="nofollow noreferrer"><code>preg_replace</code></a> — Perform a regular expression search and replace</h3>
<pre><code>&lt;?php
 preg_replace(&quot;/[^0-9]/&quot;,&quot;&quot;,$string); // string(2) &quot;11&quot;
?&gt;
</code></pre>
<h3>However</h3>
<ul>
<li>the simplicity of <code>str_replace</code> cause speed, but even limited use cases</li>
<li><code>preg_replace</code> is much <a href="https://xkcd.com/208/" rel="nofollow noreferrer">more versatile</a> than <code>str_replace</code> or <code>filter_var</code></li>
<li>instead is possible to use a function to specify what to replace using <a href="https://www.php.net/manual/en/function.preg-replace-callback" rel="nofollow noreferrer"><code>preg_replace_callback</code></a></li>
<li>with <code>preg_replace_callback</code> can do multiple replacements in one call</li>
<li><code>filter_var</code> limited in <a href="https://www.php.net/manual/en/function.filter-var.php#refsect1-function.filter-var-parameters" rel="nofollow noreferrer">sanitation options</a></li>
</ul>

I want to extract the digits from a string that contains numbers and letters like:
<pre><code>&quot;In My Cart : 11 items&quot;
</code></pre>
I want to extract the number <code>11</code>.

Extract a single (unsigned) integer from a string

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

文章

问答

视频

学习中心

腾讯云实验室

直播

竞赛

腾讯云代码分析专区

腾讯iOA零信任安全管理系统专区

腾讯云架构师技术同盟交流圈

腾讯云数据库专区

腾讯云顾问专区

腾讯云原生专区

腾讯混元专区

腾讯云TCE专区

腾讯云Lighthouse专区

腾讯云HAI专区

腾讯云Edgeone专区

腾讯云存储专区

腾讯云智能专区

腾讯轻联专区 

腾讯云开发专区

TAPD专区

腾讯轻量云游戏服专区

腾讯云最具价值专家

腾讯云架构师技术同盟

腾讯云创作之星

腾讯云开发者先锋

腾讯云代码助手

云原生构建

TAPD 敏捷项目管理

Cloud Studio

SDK中心

API中心

命令行工具

涵盖代码开发、场景应用、自动测试全流程，助你从零构建专属AI助手

一站式MCP教程库，解锁AI应用新玩法

我想从包含数字和字母的字符串中提取数字，如下所示："In My Cart : 11 items"我想提取数字11。

问从字符串中提取单个(无符号)整数
EN

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问从字符串中提取单个(无符号)整数EN