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POMatch a string in a string containing certain string in Javascript
 

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  1. POMatch a string in a string containing certain string in Javascript
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    <p>Sorry for the awful title - not sure how best to put it.</p> <p>note: Am trying to do this in Javascript</p> <p>I want to match specific text within 2 different urls which are of differing length and structure. One starts with <code>video</code> and the other with say <code>audio</code>. The match must be replaced differently depending on the start of the string.</p> <p>I can't work out how to make a dotall (.*) match in a positive lookbehind?</p> <p>For example, the strings below ought to be matched by 2 separate RegEx's, one specifying that <code>video</code> and the other <code>audio</code> must be before <code>%7bmatch%7d</code> They must <strong>only</strong> match <code>%7bmatch%7d</code> for the given string beginning.</p> <pre><code>video://lots0fr@ndomcharact#Rsinbetweenof1nd1scrimin@length/%7bmatch%7d/lots0fr@ndomcharact#Rsinbetweenof1nd1scrimin@length audio://lots0fr@ndomcharact#Rsinbetweenof1nd1scrimin@length/%7bmatch%7d/lots0fr@ndomcharact#Rsinbetweenof1nd1scrimin@length </code></pre> <p>I have tried: <code>/(?&lt;=video)(?&lt;=.*)%7bmatch%7d/g</code> <a href="http://regexr.com?373gh" rel="nofollow">http://regexr.com?373gh</a> amongst other variants and can't quite seem to only match the <code>%7bmatch%7d</code> or any other match without getting everything since <code>video</code> in the example. Got me stumped, would really appreciate a nudge in the right direction.</p> <p><strong>EDIT:</strong> Answer specific to Javascript:</p> <pre><code>// Random collection of string(s) var inputString = "video://lots0fr@ndomcharacasdf/asd/ft#Rsinbetweenof1nd1scrimin@length/%7bmatch%7d/lots0fr@ndomcharact#Rsinbetweenof1nd1scrimin@lengthaudio://lots0fr@ndomcharact#Rsinbet/asdfas/dweenof1nd1scrimin@length/%7bmatch%7d/lots0fr@ndomcharact#Rsinbetweenof1nd1scrimin@lengthvideo://lots0fr@ndomcharact#Rsinbetweasdf/asd/f/asdfenof1nd1scrimin@length/%7bmatch%7d/lots0fr@ndomcharact#Rsinbetweenof1nd1scrimin@lengthaudio://lots0fr@ndomcharaasdfafsdct#Rsinbetweenof1nd1scrimin@length/%7bmatch%7d/lots0fr@ndomcharact#Rsinbetweenof1nd1scrimin@lengthvideo://lots0fr@ndomcharact#Rsinfasdfasdfbetweenof1nd1scrimin@length/%7bmatch%7d/lots0fr@ndomcharact#Rsinbetweenof1nd1scrimin@lengthaudio://lots0fr@ndomcharaasdfasdf///asdfasdfct#Rsinbetweenof1nd1scrimin@length/%7bmatch%7d/lots0fr@ndomcharact#Rsinbetweenof1nd1scrimin@length"; // Regex to match after every `video` occurence regexVideo = new RegExp(/(video.*?)%7bmatch%7d/g); // Regex to match after every `audio` occurence regexAudio = new RegExp(/(audio.*?)%7bmatch%7d/g); // strings to replace the matches var replaceStringVideo = "&lt;span class='woot'&gt;W00tW00tVideoW00t&lt;/span&gt;"; var replaceStringAudio = "&lt;span class='woot'&gt;W00tW00tVAudioW00t&lt;/span&gt;"; // replace both audio and video with respective replace values NOTE: the dollar token needed concatenated before the replaceString. inputString.replace(regexVideo, "$1" + replaceStringVideo).replace(regexAudio, "$1" + replaceStringAudio); // This yields an inputString value of "video://lots0fr@ndomcharacasdf/asd/ft#Rsinbetweenof1nd1scrimin@length/&lt;span class='woot'&gt;W00tW00tVideoW00t&lt;/span&gt;/lots0fr@ndomcharact#Rsinbetweenof1nd1scrimin@lengthaudio://lots0fr@ndomcharact#Rsinbet/asdfas/dweenof1nd1scrimin@length/&lt;span class='woot'&gt;W00tW00tVAudioW00t&lt;/span&gt;/lots0fr@ndomcharact#Rsinbetweenof1nd1scrimin@lengthvideo://lots0fr@ndomcharact#Rsinbetweasdf/asd/f/asdfenof1nd1scrimin@length/&lt;span class='woot'&gt;W00tW00tVideoW00t&lt;/span&gt;/lots0fr@ndomcharact#Rsinbetweenof1nd1scrimin@lengthaudio://lots0fr@ndomcharaasdfafsdct#Rsinbetweenof1nd1scrimin@length/&lt;span class='woot'&gt;W00tW00tVAudioW00t&lt;/span&gt;/lots0fr@ndomcharact#Rsinbetweenof1nd1scrimin@lengthvideo://lots0fr@ndomcharact#Rsinfasdfasdfbetweenof1nd1scrimin@length/&lt;span class='woot'&gt;W00tW00tVideoW00t&lt;/span&gt;/lots0fr@ndomcharact#Rsinbetweenof1nd1scrimin@lengthaudio://lots0fr@ndomcharaasdfasdf///asdfasdfct#Rsinbetweenof1nd1scrimin@length/&lt;span class='woot'&gt;W00tW00tVAudioW00t&lt;/span&gt;/lots0fr@ndomcharact#Rsinbetweenof1nd1scrimin@length" </code></pre>
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    1. USRob Schmuecker
    1. USRob Schmuecker
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    1. COWhat language or tool are you using ?
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      1. USIbrahim Najjar
    2. COWill be using javascript if I can get it working at regexr.com
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      1. USRob Schmuecker
    3. COIts not working on regexr because it doesn't seem to support variable length lookbehinds. If you change .* to .{x} where x is the exact number of characters it would match.
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      1. USOGHaza
 

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