blocks|key|608415|text|如果字符串始终具有相同的格式，则一个简单的substr()就足够了。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|608416|var+newString+=+originalStrint.substr(4)|code-block|syntax|javascript|608417|entityMap^0|L|8|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

If the string has always the same format, a simple <code>substr()</code> should suffice.

<pre><code>var newString = originalStrint.substr(4)
</code></pre>

blocks|key|608439|text|请尝试以下操作|type|unstyled|depth|inlineStyleRanges|entityRanges|data|608440|var+original+=+'www.test.com';
var+stripped+=+original.substring(4);|code-block|syntax|javascript|608441|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|$]]

Try the following

<pre><code>var original = 'www.test.com';
var stripped = original.substring(4);
</code></pre>

blocks|key|392292|text|取决于您的需求，您有几个选择，您可以这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|392293|//+this+will+replace+the+first+occurrence+of+"www."+and+return+"testwww.com"
"www.testwww.com".replace("www.",+"");

//+this+will+slice+the+first+four+characters+and+return+"testwww.com"
"www.testwww.com".slice(4);

//+this+will+replace+the+www.+only+if+it+is+at+the+beginning
"www.testwww.com".replace(/%5E(www\.)/,"");|code-block|syntax|javascript|392294|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|$]]

Depends on what you need, you have a couple of choices, you can do:

<pre><code>// this will replace the first occurrence of "www." and return "testwww.com"
"www.testwww.com".replace("www.", "");

// this will slice the first four characters and return "testwww.com"
"www.testwww.com".slice(4);

// this will replace the www. only if it is at the beginning
"www.testwww.com".replace(/^(www\.)/,"");
</code></pre>

blocks|key|608520|text|您可以剪切网址并使用response.sendredirect(新网址)，这将把您带到与新网址相同的页面|type|unstyled|depth|inlineStyleRanges|entityRanges|data|608521|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

You can cut the url and use response.sendredirect(new url), this will bring you to the same page with the new url

blocks|key|392387|text|要么是手动的，比如|type|unstyled|depth|inlineStyleRanges|entityRanges|data|392388|var+str+=+"www.test.com",
++++rmv+=+"www.";

str+=+str.slice(+str.indexOf(+rmv+)+%2B+rmv.length+);|code-block|syntax|javascript|392389|或者只使用.replace()|offset|length|style|CODE|392390|str+=+str.replace(+rmv,+''+);|392391|entityMap^0|0|0|5|A|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@$I|T|J|U|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Either manually, like

<pre><code>var str = "www.test.com",
 rmv = "www.";

str = str.slice( str.indexOf( rmv ) + rmv.length );
</code></pre>

or just use <code>.replace()</code>:

<pre><code>str = str.replace( rmv, '' );
</code></pre>

blocks|key|608620|text|是的，有一个RegExp，但您不需要使用它或任何“智能”函数：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|608621|var+url+=+"www.testwww.com";
var+PREFIX+=+"www.";
if+(url.startsWith(PREFIX))+{
++//+PREFIX+is+exactly+at+the+beginning
++url+=+url.slice(PREFIX.length);
}|code-block|syntax|javascript|608622|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|$]]

Yes, there is a RegExp but you don't need to use it or any &quot;smart&quot; function:
<pre><code>var url = &quot;www.testwww.com&quot;;
var PREFIX = &quot;www.&quot;;
if (url.startsWith(PREFIX)) {
 // PREFIX is exactly at the beginning
 url = url.slice(PREFIX.length);
}
</code></pre>

blocks|key|392483|text|您可以使用removePrefix函数重载字符串原型：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|392484|String.prototype.removePrefix+=+function+(prefix)+{
++++const+hasPrefix+=+this.indexOf(prefix)+===+0;
++++return+hasPrefix+?+this.substr(prefix.length)+:+this.toString();
};|code-block|syntax|javascript|392485|用法：|392486|const+domain+=+"www.test.com".removePrefix("www.");+//+test.com|392487|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|$]]

You can overload the String prototype with a removePrefix function:

<pre><code>String.prototype.removePrefix = function (prefix) {
 const hasPrefix = this.indexOf(prefix) === 0;
 return hasPrefix ? this.substr(prefix.length) : this.toString();
};
</code></pre>

usage:

<pre><code>const domain = "www.test.com".removePrefix("www."); // test.com
</code></pre>

blocks|key|608693|text|另一种方式：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|608694|Regex.Replace(urlString,+"www.(.%2B)",+"$1");|code-block|syntax|javascript|608695|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|$]]

Another way:

<pre><code>Regex.Replace(urlString, "www.(.+)", "$1");
</code></pre>

blocks|key|392520|text|const+removePrefix+=+(value,+prefix)+=>
+++value.startsWith(prefix)+?+value.slice(prefix.length)+:+value;|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|392521|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>const removePrefix = (value, prefix) =&gt;
 value.startsWith(prefix) ? value.slice(prefix.length) : value;
</code></pre>

I want to remove the "<code>www.</code>" part from the beginning of an URL string

For instance in these test cases:

e.g. <code>www.test.com</code> → <code>test.com</code> 
e.g. <code>www.testwww.com</code> → <code>testwww.com</code> 
e.g. <code>testwww.com</code> → <code>testwww.com</code> (if it doesn't exist)

Do I need to use Regexp or is there a smart function?

Remove the string on the beginning of an URL

我想删除URL字符串开头的"www.“部分。例如，在这些测试用例中：例如www.test.com test.com→例如www.testwww.com testwww.com→例如，testwww.com testwww.com→(如果它不存在)我需要使用Regexp吗?还是有一个智能函数？

问删除URL开头的字符串
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