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    <p>Here is a way to create a JavaScript look behind that has worked in all cases I needed.</p> <p>This is an example. One can do many more complex and flexible things.</p> <p>The main point here is that in some cases, it is possible to create a RegExp non-capturing prefix (look behind) construct in JavaScript .</p> <p>This example is designed to extract all fields that are surrounded by braces '{...}'. The braces are not returned with the field.</p> <p>This is just an example to show the idea at work not necessarily a prelude to an application.</p> <pre><code> function testGetSingleRepeatedCharacterInBraces() { var leadingHtmlSpaces = '&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;' ; // The '(?:\b|\B(?={))' acts as a prefix non-capturing group. // That is, this works (?:\b|\B(?=WhateverYouLike)) var regex = /(?:\b|\B(?={))(([0-9a-zA-Z_])\2{4})(?=})/g ; var string = '' ; string = 'Message has no fields' ; document.write( 'String =&gt; "' + string + '"&lt;br&gt;' + leadingHtmlSpaces + 'fields =&gt; ' + getMatchingFields( string, regex ) + '&lt;br&gt;' ) ; string = '{LLLLL}Message {11111}{22222} {ffffff}abc def{EEEEE} {_____} {4444} {666666} {55555}' ; document.write( 'String =&gt; "' + string + '"&lt;br&gt;' + leadingHtmlSpaces + 'fields =&gt; ' + getMatchingFields( string, regex ) + '&lt;br&gt;' ) ; } ; function getMatchingFields( stringToSearch, regex ) { var matches = stringToSearch.match( regex ) ; return matches ? matches : [] ; } ; Output: String =&gt; "Message has no fields" fields =&gt; String =&gt; "{LLLLL}Message {11111}{22222} {ffffff}abc def{EEEEE} {_____} {4444} {666666} {55555}" fields =&gt; LLLLL,11111,22222,EEEEE,_____,55555 </code></pre>
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    1. POJavascript RegEx non-capturing prefix
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    1. COThis isn't doing what you think it does. The `\B(?={)` option asserts that the next character is `{`, but that character has to match `[0-9a-zA-Z_]` to satisfy the rest of the regex. Your `(?:\b|\B(?={))` might as well be simply `\b`, because the second alternative will never participate in a match.
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      1. USAlan Moore
 

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