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Asked: 2026-05-12T12:23:31+00:00

Need some help, I have a regular expression that appears to work just fine

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Need some help, I have a regular expression that appears to work just fine when I put the pattern and string to parse into regexlib’s tester. However, when I put it into C#, the same does not happen, no match.

Here is my match pattern, have tried both:

string regPattern = "\\{\\$([^\\$\\}]+)\\$\\}";

My string to parse comes from a database and is put into a variable after using ToString(). Here is a sample of the string (using Text Visualizer in VS2008) that works at regextlib but not in C#.

<p>1.Age?: -- Select One --<br />
2.HowFindProduct?: Friend/Relative Recommendation<br />
3.Influencers?: {$InfluencedDecision$}<br />
4.WherePurchase?: Office Superstore - i.e. Staples_ Office Depot_ Of<br />
5.ReplacementProduct?: This is a replacement to my previous product<br />
6.OtherBrands?: {$OtherBrands$}<br />
7.Income?: -- Select One --<br />
FirstName: John<br />
Initial: H<br />
LastName: Smith<br />
Address1: 123 any street<br />
Address2: suite 2<br />
City: any city<br />
State: CA<br />
ZipCode: 55555<br />
Country: usa<br />
EmailAddress: test@test.com<br />
Phone#: 714-555-1212<br />
ModelNumber: AXXXX<br />
SerialNumber: 23123d234s2s<br />
DateofPurchase: 09/09/2009<br />
NotifyMe1: on<br />
NotifyMe2: on</p>

And while simple, if it helps, here is the code I am using:

string regPattern = "\\{\\$([^\\$\\}]+)\\$\\}";
Regex.Replace(bodytext.ToString(), regPattern, "",RegexOptions.Multiline);

I have also tried declaring pattern using @ and Regex.Escape. Need some help here.

Any ideas?

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1 Answer

  1. Editorial Team

    Well, your second statement is currently fairly pointless because you’re ignoring the return value. Don’t forget that strings are immutable – calling Regex.Replace won’t change any existing strings; it will return a new string with the appropriate replacement operations performed. If you do this:

    string regPattern = "\\{\\$([^\\$\\}]+)\\$\\}";
string replacedText = Regex.Replace(bodytext.ToString(), regPattern, 
                                    "", RegexOptions.Multiline);

    then replacedText is the original with things like {$OtherBrands$} removed – I’ve tried that in a test program. If that’s not what you wanted, please give more information about what you’re actually trying to do.

    Having said that, your regular expression pattern would be clearer using a verbatim string literal:

    string regPattern = @"\{\$([^\$\}]+)\$\}";
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