blocks|key|785485|text|您可以使用/radius=\d%2B/来匹配"radius=“，后面跟着任意数量的数字。使用此方法，我们可以使用replace()方法将其替换为所需的值：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|785486|​|785487|var+str+=+"/results?radius=4000&newFilter=true";
var+replacement+=+123;

var+newStr+=+str.replace(/radius=\d%2B/,+"radius="+%2B+replacement);

console.log(newStr);|code-block|syntax|javascript|785488|785489|entityMap^0|5|C|1I|9|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]|$9|S|A|T|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|U|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|V|8|@]|D|@]|E|$K|L]]|$1|M|3|G|5|6|7|W|8|@]|D|@]|E|$]]|$1|N|3|-4|5|6|7|X|8|@]|D|@]|E|$]]]|O|$]]

<p>You can use <code>/radius=\d+/</code> to match "radius=" followed by any number of digits. With this we can use the <code>replace()</code> method to replace it with the desired value:</p>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>var str = "/results?radius=4000&amp;newFilter=true";
var replacement = 123;

var newStr = str.replace(/radius=\d+/, "radius=" + replacement);

console.log(newStr);</code></pre>
</div>
</div>
</p>


blocks|key|1012498|text|它应该像简单一样容易|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1012499|var+str='/results?radius=4000&newFilter=true';
var+n+=+1234;

str+=+str.replace(/(radius=)(\d%2B)/,+"$1"+%2B+n);|code-block|syntax|javascript|1012500|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|$]]

<p>It should be as easy as</p>

<pre><code>var str='/results?radius=4000&amp;newFilter=true';
var n = 1234;

str = str.replace(/(radius=)(\d+)/, "$1" + n);
</code></pre>


blocks|key|2498745|text|var+url+=+"/results?radius=4000&newFilter=true";+
//+or+window.location.href+for+current+url
var+captured+=+/radius=([%5E&]%2B)/.exec(url)[1];+//+your+4000
var+newValue+=+5000;
url+=+url.replace(captured,+newValue);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|2498746|通过这种方式，您也可以使用它获取所请求的所有参数，并且它不是十进制绑定的。|unstyled|2498747|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>var url = "/results?radius=4000&amp;newFilter=true"; 
// or window.location.href for current url
var captured = /radius=([^&amp;]+)/.exec(url)[1]; // your 4000
var newValue = 5000;
url = url.replace(captured, newValue);
</code></pre>

<p>by this way you can use it to get all your requested parameters too
and it is not decimal binded</p>


blocks|key|2498775|text|如果您想获得所有参数，可以尝试如下：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2498776|​|2498777|function+getParams(uri)+{

	var+params+=+{},
++++++++tokens,
++++++++re+=+/[?&]?([%5E=]%2B)=([%5E&]*)/g;
++++++++
++++while+(tokens+=+re.exec(uri))+{
++++++++params[decodeURIComponent(tokens[1])]+=+decodeURIComponent(tokens[2]);
++++}
++++return+params;
}

var+str='/results?radius=4000&newFilter=true';

str+=+str.substring(str.indexOf("?"));
params+=+getParams(str);

console.log(params);
console.log('radius+=>+',+params['radius']);|code-block|syntax|javascript|2498778|2498779|这个答案来自于这篇文章：如何从get参数中获得值？|offset|length|2498780|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/979975/how-to-get-the-value-from-the-get-parameters#1099670^0|0|0|0|0|C|D|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|W|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|X|8|@]|9|@]|A|$G|H]]|$1|I|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|Z|8|@]|9|@$L|10|M|11|1|12]]|A|$]]|$1|N|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|O|$P|$5|Q|R|S|A|$T|U]]]]

<p>If you want to get all parameters you can try this : </p>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>function getParams(uri) {

	var params = {},
        tokens,
        re = /[?&amp;]?([^=]+)=([^&amp;]*)/g;
        
    while (tokens = re.exec(uri)) {
        params[decodeURIComponent(tokens[1])] = decodeURIComponent(tokens[2]);
    }
    return params;
}

var str='/results?radius=4000&amp;newFilter=true';

str = str.substring(str.indexOf("?"));
params = getParams(str);

console.log(params);
console.log('radius =&gt; ', params['radius']);</code></pre>
</div>
</div>
</p>

<p>This answer is from this post: <a href="https://stackoverflow.com/questions/979975/how-to-get-the-value-from-the-get-parameters#1099670">How to get the value from the GET parameters?</a></p>


blocks|key|2498803|text|使用正向后查找的正则表达式的ES6|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2498804|​|2498805|const+string+++++++=+'/results?radius=4000&newFilter=true',
++++++n++++++++++++=+'1234',
++++++changeRadius+=+(radius)+=>+string.replace(/(?<=radius=)\d%2B/,+n);

console.log(changeRadius(n));|code-block|syntax|javascript|2498806|/*+Output+console+formatting+*/
.as-console-wrapper+{+top:+0;+}|2498807|2498808|changeRadius是接受一个参数(radius)并执行替换的函数。|unordered-list-item|offset|length|style|CODE|2498809|关于正则表达式：\d%2B获取尽可能多的数字，(?<=STRING)是一个正向后视。|2498810|其他要领|2498811|changeRadius()函数的体可以用string.replace(/radius=\d%2B/,+'radius='+%2B+n)代替。它可能有更好的性能，但原来的正则表达式是更直接的翻译问题。|2498812|entityMap|0|LINK|mutability|MUTABLE|url|http://www.regular-expressions.info/lookaround.html^0|0|0|0|0|0|0|C|K|6|0|8|3|L|B|Z|4|0|0|0|0|E|L|17|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|17|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|18|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|F|7|19|8|@]|9|@]|A|$G|H]]|$1|K|3|C|5|6|7|1A|8|@]|9|@]|A|$]]|$1|L|3|M|5|N|7|1B|8|@$O|1C|P|1D|Q|R]|$O|1E|P|1F|Q|R]]|9|@]|A|$]]|$1|S|3|T|5|N|7|1G|8|@$O|1H|P|1I|Q|R]|$O|1J|P|1K|Q|R]]|9|@$O|1L|P|1M|1|1N]]|A|$]]|$1|U|3|V|5|6|7|1O|8|@]|9|@]|A|$]]|$1|W|3|X|5|6|7|1P|8|@$O|1Q|P|1R|Q|R]|$O|1S|P|1T|Q|R]]|9|@]|A|$]]|$1|Y|3|-4|5|6|7|1U|8|@]|9|@]|A|$]]]|Z|$10|$5|11|12|13|A|$14|15]]]]

<h2>ES6 with regex using positive lookbehind</h2>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="true">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>const string       = '/results?radius=4000&amp;newFilter=true',
      n            = '1234',
      changeRadius = (radius) =&gt; string.replace(/(?&lt;=radius=)\d+/, n);

console.log(changeRadius(n));</code></pre>
<pre class="snippet-code-css lang-css prettyprint-override"><code>/* Output console formatting */
.as-console-wrapper { top: 0; }</code></pre>
</div>
</div>
</p>

<ul>
<li><code>changeRadius</code> is function that takes one parameter (<code>radius</code>) and performs replacement.</li>
<li>About the regex: <code>\d+</code> gets as many digits as possible, <code>(?&lt;=STRING)</code> is a <a href="http://www.regular-expressions.info/lookaround.html" rel="nofollow noreferrer">positive lookbehind</a>.</li>
</ul>

<h3>Other regex</h3>

<p>Body of <code>changeRadius()</code> function can be replaced with <code>string.replace(/radius=\d+/, 'radius=' + n)</code>. It probably has better performance, but original regex is more direct translation of the problem.</p>


blocks|key|785571|text|您可以在不记得匹配的情况下使用捕获来捕获“radius=”之后的数值。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|785572|var+url+=+"/results?radius=4000&newFilter=true";

var+radius+=+123;

var+newUrl+=+url.replace(/(?:radius=){1}(\d%2B)/,+radius);

console.log(newUrl);+//+logs+'/results?radius=4000&newFilter=true'0|code-block|syntax|javascript|785573|‘|785574|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|$]]

<p>You can use capturing without remembering the match to capture only the numerical value after 'radius='.</p>

<pre><code>var url = "/results?radius=4000&amp;newFilter=true";

var radius = 123;

var newUrl = url.replace(/(?:radius=){1}(\d+)/, radius);

console.log(newUrl); // logs '/results?radius=4000&amp;newFilter=true'0
</code></pre>

<p>'</p>


<p>I have this string</p>

<pre><code>/results?radius=4000&amp;newFilter=true
</code></pre>

<p>and I need to replace <code>radius=4000</code> with <code>radius=n</code> where n is a variable.</p>

<p>How can I use <code>String.replace()</code> method with regex to match that part?</p>


Javascript regex match number after 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。

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我有这根绳子/results?radius=4000&newFilter=true我需要将radius=4000替换为radius=n，其中n是变量。如何使用正则表达式的String.replace()方法来匹配该部分？

问Javascript正则表达式匹配一个接一个字符串
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问Javascript正则表达式匹配一个接一个字符串EN