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PORegex back references in Regex.Replace()
 

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  1. PORegex back references in Regex.Replace()
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    <p>I'm using a regex to replace values within some html code. It correctly matches all instances within the html code but when using Regex.Replace() with back references it doesn't replace the back references.</p> <p>For example</p> <pre><code>html = "&lt;td&gt;[element]elementreference='oldvalue';[/element]&lt;/td&gt;"; html = Regex.Replace(html, @"(['""#(=])" + elementReference.Key + @"(['""#)];|&amp;)", "$1" + elementReference.Value + "$2", RegexOptions.IgnoreCase); </code></pre> <p>results in: </p> <pre><code>"&lt;td&gt;[element]elementreference=$1newvalue'[/element]&lt;/td&gt;" </code></pre> <p>but if I use</p> <pre><code>html = "&lt;td&gt;[element]elementreference='oldvalue';[/element]&lt;/td&gt;"; var regex = new Regex(@"(['""#(=])" + elementReference.Key + @"(['""#)];|&amp;)", RegexOptions.IgnoreCase); foreach (Match match in regex.Matches(html)) { html = html.Replace(match.Value, match.Groups[1] + elementReference.Value + match.Groups[2]); } </code></pre> <p>the result is </p> <pre><code>"&lt;td&gt;[element]elementreference='newvalue'[/element]&lt;/td&gt;" </code></pre> <p>which is what I expected.</p> <p>Can anyone explain why using Regex.Replace() did not work?</p> <p><strong>EDIT</strong></p> <p>I am not attempting to replace the inner html, I am attempting to replace the <code>'oldvalue'</code> part of <code>[element]elementreference='oldvalue'[/element]</code>, which just happens to be in a html tag. My problem lies with the fact that I am trying to replace the apostrophe around the text, by using a back reference. This apostrophe could be a number of values, that is why I am using a back reference.</p>
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    1. USLisa Young
    1. USLisa Young
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    1. COhttp://stackoverflow.com/questions/1732348/regex-match-open-tags-except-xhtml-self-contained-tags/1732454#1732454
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      1. USdoctorless
    2. CODon't use regex's to parse HTML - get HTMLAgilityPack instead. http://stackoverflow.com/a/1732454/847383
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      1. USPhonicUK
    3. COcould you further explain your problem? your provided output is exactly what I would expect your regex to create.
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      1. USSam I am
 

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