Home/ Questions/Q 6921423
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-27T10:16:30+00:00

why does this regex fail to match: (?<=Title = 8:)[^]*(?=) this: ARPHELPTELEPHONE = 8:

  • 0

why does this regex fail to match:

(?<="Title" = "8:)[^"]*(?=")

this:

"ARPHELPTELEPHONE" = "8:"
"ARPHELPLINK" = "8:"
"Title" = "8:something"
"Subject" = "8:"
"ARPCONTACT" = "8:something"
"Keywords" = "8:"

Its in excerpt from a visual studio setup project. It matches in the online tool i’m using but it doesn’t match using Regex.Match()

Here’s the code:

var productTitleRegex = @"(?<=""Title"" = ""8:)[^""]*(?="")";
var titleMatch = Regex.Match(content, productTitleRegex);

titleMatch.Success if false and value returns nothing

EDIT:

Maybe I’m just missing something when using Look ahead and look behind in .net regex? Because if I remove the lookarounds, this works but it matches the whole line, which I don’t want. So I used lookarounds to just match the value I want.

Anyone else had a similar experience when using lookarounds in .net regex?

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    I tested your regex pattern with C# in VS2008, it found a match with “something” as value. looks like it is working fine. I also tested it with free tool downloaded from http://www.radsoftware.com.au/regexdesigner/

    enter image description here

    However It won’t work if your using RegEX with RegexOptions “IgnorePatternWhitespace”

        var productTitleRegex = @"(?<=""Title"" = ""8:)[^""]*(?="")";
    var titleMatch = Regex.Match(content, productTitleRegex, RegexOptions.IgnorePatternWhitespace);

    in this case you won’t get any match

    • 0