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POjavascript dynamic regex vs hard typed and captures
 

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  1. POjavascript dynamic regex vs hard typed and captures
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    <p>I've been at this for hours -- I think I need sleep... but no matter how I alter the expression javascript will only capture the 1st and 3rd elements:</p> <pre><code>var number = 09416; var mat = "([0-9]+/[0-9]+/[0-9]+\\s+[0-9]+:[0-9]+)\\s+([A-Z]+)\\s+[0-9,]+\\s+(.*?"+number+".+)"; // month / day / year hour : min AMPM byte size filename containing number in middle var pattern = new RegExp(mat,"gi"); var arr = ['09/07/2010 07:08 PM 1,465,536 BOL09416 BOL31.exe', '09/06/2010 12:13 PM 110,225 BOL09416_BOL030.exe', '09/08/2010 04:46 AM 60,564 BOL09416_BOL32.exe', '09/08/2010 01:08 PM 63,004 bol09416_bol33.exe'] for (var i=0;i&lt;arr.length;i++){ var match = pattern.exec(arr[i]); alert(match); } </code></pre> <p>It is all spaces (no tabs), I've rewriten the regex to be as explainatory as possible... It correctly matches on arr[0] and arr[2], but nulls on the other two. Tried looking for possible typo's, trying different .+,.*,.+? etc. All online matchers show that it should be working: <a href="http://regexr.com?2s44k" rel="nofollow noreferrer">Example</a></p> <p>Anybody have any ideas as to what I'm missing?</p> <p>====================<br> Update:</p> <p>Going through all the awesome suggestions I am stumped even further:</p> <pre><code>var match = arr[i].match(/([0-9]+\/[0-9]+\/[0-9]+\s+[0-9]+:[0-9]+)\s+([A-Z]+)\s+[0-9,]+\s+(.*?09416.+)/g); </code></pre> <p>gives <code>match[0]</code> = full string <code>match[1]</code> = undefined. Basically no captures.</p> <p>where as:</p> <pre><code>var match = /([0-9]+\/[0-9]+\/[0-9]+\s+[0-9]+:[0-9]+)\s+([A-Z]+)\s+[0-9,]+\s+(.*?09416.+)/g.exec(arr[i]); </code></pre> <p>DOES return <code>match[0]</code> = full string, <code>match[1]</code> = date, and so on.</p> <p>So I guess my real question is how to include dynamically made RegExpressions, and have multiple captures? As the only difference between:</p> <pre><code>var number = "09416"; var mat = "([0-9]+/[0-9]+/[0-9]+\\s+[0-9]+:[0-9]+)\\s+([A-Z]+)\\s+[0-9,]+\\s+(.*?09416.+)"; var pattern = new RegExp(mat,'g'); </code></pre> <p>and </p> <pre><code>/([0-9]+\/[0-9]+\/[0-9]+\s+[0-9]+:[0-9]+)\s+([A-Z]+)\s+[0-9,]+\s+(.*?09416.+)/g.exec(arr[i]); </code></pre> <p>is that I hard-typed the number.</p>
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