blocks|key|645271|text|如果你想拥有这个\\test\red\bob\fred\new字符串，你应该转义所有的反斜杠(\)。当您编写\\test\\red\\bob\\fred\\new时，您的字符串实际上包含单个反斜杠。你可以确信这会打印出你的字符串。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|645272|因此，如果字符串中的反斜杠被转义，myString.replace(/\W/g,'')将正常工作。|645273|entityMap^0|8|N|1B|1|1I|R|0|H|Q|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|I|$]]

If you want to have this <code>\\test\red\bob\fred\new</code> string, you should escape all backslashes (<code>\</code>). When you write <code>\\test\\red\\bob\\fred\\new</code> your string actually contains single backslashes. You can be sure of this printing your string. 
So if backslashes in your string are escaped <code>myString.replace(/\W/g,'')</code> will work normally.

blocks|key|645317|text|删除非字母数字字符|type|unstyled|depth|inlineStyleRanges|entityRanges|data|645318|下面是/a从输入字符串中剔除非字母数字字符的正确正则表达式：|645319|input.replace(/\W/g,+'')|code-block|syntax|javascript|645320|请注意，\W等同于[%5E0-9a-zA-Z_]+-它包含下划线字符。要同时删除下划线，请使用以下命令：|offset|length|style|CODE|645321|input.replace(/[%5E0-9a-z]/gi,+'')|645322|输入格式不正确|645323|由于测试字符串包含各种转义字符，这些字符不是字母数字字符，因此它将删除它们。|645324|如果要按字面理解，字符串中的反斜杠需要转义：|645325|"\\test\\red\\bob\\fred\\new".replace(/\W/g,+'')
"testredbobfrednew"+//+output|645326|处理格式错误的字符串|645327|如果你不能正确地转义输入字符串(何乐而不为呢？)，或者它来自某种不可信的/错误配置的来源-你可以这样做：|645328|JSON.stringify("\\test\red\bob\fred\new").replace(/\W/g,+'')
"testredbobfrednew"+//+output|645329|请注意，字符串的json表示包括引号：|645330|JSON.stringify("\\test\red\bob\fred\new")
""\\test\red\bob\fred\new""|645331|但是它们也会被替换的正则表达式删除。|645332|entityMap^0|0|0|0|4|2|9|D|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1C|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1D|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|1E|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|1F|8|@$K|1G|L|1H|M|N]|$K|1I|L|1J|M|N]]|9|@]|A|$]]|$1|O|3|P|5|F|7|1K|8|@]|9|@]|A|$G|H]]|$1|Q|3|R|5|6|7|1L|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|1M|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|1N|8|@]|9|@]|A|$]]|$1|W|3|X|5|F|7|1O|8|@]|9|@]|A|$G|H]]|$1|Y|3|Z|5|6|7|1P|8|@]|9|@]|A|$]]|$1|10|3|11|5|6|7|1Q|8|@]|9|@]|A|$]]|$1|12|3|13|5|F|7|1R|8|@]|9|@]|A|$G|H]]|$1|14|3|15|5|6|7|1S|8|@]|9|@]|A|$]]|$1|16|3|17|5|F|7|1T|8|@]|9|@]|A|$G|H]]|$1|18|3|19|5|6|7|1U|8|@]|9|@]|A|$]]|$1|1A|3|-4|5|6|7|1V|8|@]|9|@]|A|$]]]|1B|$]]

<h2>Removing non-alphanumeric chars</h2>

The following is the/a correct regex to strip non-alphanumeric chars from an input string:

<pre><code>input.replace(/\W/g, '')
</code></pre>

Note that <code>\W</code> is the equivalent of <code>[^0-9a-zA-Z_]</code> - it includes the underscore character. To also remove underscores use e.g.:

<pre><code>input.replace(/[^0-9a-z]/gi, '')
</code></pre>

<h2>The input is malformed</h2>

Since the test string contains various escaped chars, which are not alphanumeric, it will remove them.

A backslash in the string needs escaping if it's to be taken literally:

<pre><code>"\\test\\red\\bob\\fred\\new".replace(/\W/g, '')
"testredbobfrednew" // output
</code></pre>

<h2>Handling malformed strings</h2>

If you're not able to escape the input string correctly (why not?), or it's coming from some kind of untrusted/misconfigured source - you can do something like this:

<pre><code>JSON.stringify("\\test\red\bob\fred\new").replace(/\W/g, '')
"testredbobfrednew" // output
</code></pre>

Note that the json representation of a string includes the quotes:

<pre><code>JSON.stringify("\\test\red\bob\fred\new")
""\\test\red\bob\fred\new""
</code></pre>

But they are also removed by the replacement regex.

blocks|key|430718|text|目前所有的答案都有一些奇怪的地方，我能想到的最好的办法是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|430719|string.replace(/[%5EA-Za-z0-9]/g,+'');|code-block|syntax|javascript|430720|下面是一个示例，它捕获了我在键盘上找到的每个键：|430721|var+string+=+'123abcABC-_*(!@#$%25%5E&*()_-={}[]:\"<>,.?/~`';
var+stripped+=+string.replace(/[%5EA-Za-z0-9]/g,+'');
console.log(stripped);|430722|输出：'123abcABC‘。|430723|entityMap^0|0|0|0|0|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]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

All of the current answers still have quirks, the best thing I could come up with was:
<pre><code>string.replace(/[^A-Za-z0-9]/g, '');
</code></pre>
Here's an example that captures every key I could find on the keyboard:
<pre><code>var string = '123abcABC-_*(!@#$%^&amp;*()_-={}[]:\&quot;&lt;&gt;,.?/~`';
var stripped = string.replace(/[^A-Za-z0-9]/g, '');
console.log(stripped);
</code></pre>
Outputs: '123abcABC'.

blocks|key|430728|text|你可以试试这个正则表达式：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|430729|value.replace(/[\W_]/g,+'');|code-block|syntax|javascript|430730|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 try this regex:
<pre><code>value.replace(/[\W_]/g, '');
</code></pre>

blocks|key|645446|text|这将删除所有非字母数字字符，保留大小写，并保留单词之间的空格。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|645447|function+alpha_numeric_filter+(string)+{

++const+alpha_numeric+=+Array.from('abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'+%2B+'+')

++const+json_string+=+JSON.stringify(string)

++let+filterd_string+=+''

++for+(let+i+=+0;+i+<+json_string.length;+i%2B%2B)+{

++++let+char+=+json_string[i]
++++let+index+=+alpha_numeric.indexOf(char)
++++if+(index+>+-1)+{
++++++filterd_string+%2B=+alpha_numeric[index]
++++}

++}

++return+filterd_string

}

const+input+=+"\\test\red\bob\fred\new"
console.log(alpha_numeric_filter(input))+//=>+testredbobfrednew

const+complex_string+=+"/_&_This!&!!+is!@#$%25+a%25%5E&*()+Sentence%2B=-[]{}+123:;\%7C\\]%7C%7C~`/.,><"
console.log(alpha_numeric_filter(complex_string))+//=>+This+is+a+Sentence+123|code-block|syntax|javascript|645448|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 removes all non-alphanumeric characters, preserves capitalization, and preserves spaces between words.

<pre><code>function alpha_numeric_filter (string) {

 const alpha_numeric = Array.from('abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789' + ' ')

 const json_string = JSON.stringify(string)

 let filterd_string = ''

 for (let i = 0; i &lt; json_string.length; i++) {

 let char = json_string[i]
 let index = alpha_numeric.indexOf(char)
 if (index &gt; -1) {
 filterd_string += alpha_numeric[index]
 }

 }

 return filterd_string

}

const input = "\\test\red\bob\fred\new"
console.log(alpha_numeric_filter(input)) //=&gt; testredbobfrednew

const complex_string = "/_&amp;_This!&amp;!! is!@#$% a%^&amp;*() Sentence+=-[]{} 123:;\|\\]||~`/.,&gt;&lt;"
console.log(alpha_numeric_filter(complex_string)) //=&gt; This is a Sentence 123
</code></pre>

blocks|key|430862|text|下面是一个您可以使用的示例，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|430863|function+removeNonAplhaNumeric(str){
++++return+str.replace(/[\W_]/g,"");
}

removeNonAplhaNumeric("0_0+(:+/-\+:)+0-0");|code-block|syntax|javascript|430864|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|$]]

Here is an example that you can use,

<pre><code>function removeNonAplhaNumeric(str){
 return str.replace(/[\W_]/g,"");
}

removeNonAplhaNumeric("0_0 (: /-\ :) 0-0");
</code></pre>

blocks|key|645570|text|要在包含英文字母的同时包含阿拉伯字母，您可以使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|645571|//+Output:+نصعربي
"ن$%25%5E&*(ص+ع___ربي".replace(/[%5E0-9a-z\u0600-\u06FF]/gi,+'');|code-block|syntax|javascript|645572|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|$]]

To include Arabic letters alongside with English letters, you can use:
<pre><code>// Output: نصعربي
&quot;ن$%^&amp;*(ص ع___ربي&quot;.replace(/[^0-9a-z\u0600-\u06FF]/gi, '');
</code></pre>

blocks|key|645633|text|如果您使用的是除英语之外的其他语言，则需要添加unicode的相对块范围。下面是西里尔文的一个例子：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|645634|.replace(/[%5E0-9A-Za-z_\u0400-\u04FF]/gi,+'')|code-block|syntax|javascript|645635|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|$]]

If you have the case of another language in addition to English you need to add the relative block range from unicode. Here is an example for Cyrillic:
<pre><code>.replace(/[^0-9A-Za-z_\u0400-\u04FF]/gi, '')
</code></pre>

I want to convert the following string to the provided output. 

<pre><code>Input: "\\test\red\bob\fred\new"
Output: "testredbobfrednew"
</code></pre>

I've not found any solution that will handle special characters like <code>\r</code>, <code>\n</code>, <code>\b</code>, etc.

Basically I just want to get rid of anything that is not alphanumeric. Here is what I've tried...

<pre><code>Attempt 1: "\\test\red\bob\fred\new".replace(/[_\W]+/g, "");
Output 1: "testedobredew"

Attempt 2: "\\test\red\bob\fred\new".replace(/['`~!@#$%^&amp;*()_|+-=?;:'",.&lt;&gt;\{\}\[\]\\\/]/gi, "");
Output 2: "testedobred [newline] ew"

Attempt 3: "\\test\red\bob\fred\new".replace(/[^a-zA-Z0-9]/, "");
Output 3: "testedobred [newline] ew"

Attempt 4: "\\test\red\bob\fred\new".replace(/[^a-z0-9\s]/gi, '');
Output 4: "testedobred [newline] ew"
</code></pre>

One other attempt with multiple steps

<pre><code>function cleanID(id) {
 id = id.toUpperCase();
 id = id.replace( /\t/ , "T");
 id = id.replace( /\n/ , "N");
 id = id.replace( /\r/ , "R");
 id = id.replace( /\b/ , "B");
 id = id.replace( /\f/ , "F");
 return id.replace( /[^a-zA-Z0-9]/ , "");
}
</code></pre>

with results

<pre><code>Attempt 1: cleanID("\\test\red\bob\fred\new");
Output 1: "BTESTREDOBFREDNEW"
</code></pre>

Any help would be appreciated.

Working Solution:

<pre><code>Final Attempt 1: return JSON.stringify("\\test\red\bob\fred\new").replace( /\W/g , '');
Output 1: "testredbobfrednew"
</code></pre>

Remove not alphanumeric characters from string

JSON

我希望将以下字符串转换为所提供的输出。Input:  "\\test\red\bob\fred\new"Output: "testredbobfrednew"我还没有找到任何可以处理特殊字符的解决方案，比如\r、\n、\b等。基本上，我只是想摆脱任何不是字母数字的东西。这是我尝试过的.Attempt 1: "\\tes...

问从字符串中删除非字母数字字符
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