C# Regex for Guid

by

This one is quite simple and does not require a delegate as you say.

resultString = Regex.Replace(subjectString, 
     @"(?im)^[{(]?[0-9A-F]{8}[-]?(?:[0-9A-F]{4}[-]?){3}[0-9A-F]{12}[)}]?$", 
     "'$0'");

This matches the following styles, which are all equivalent and acceptable formats for a GUID.

ca761232ed4211cebacd00aa0057b223
CA761232-ED42-11CE-BACD-00AA0057B223
{CA761232-ED42-11CE-BACD-00AA0057B223}
(CA761232-ED42-11CE-BACD-00AA0057B223)

Update 1

@NonStatic makes the point in the comments that the above regex will match false positives which have a wrong closing delimiter.

This can be avoided by regex conditionals which are broadly supported.

Conditionals are supported by the JGsoft engine, Perl, PCRE, Python, and the .NET framework.
Ruby supports them starting with version 2.0. Languages such as Delphi, PHP, and R that
have regex features based on PCRE also support conditionals. (source http://www.regular-expressions.info/conditional.html)

The regex that follows Will match

{123}
(123)
123

And will not match

{123)
(123}
{123
(123
123}
123)

Regex:

^({)?(\()?\d+(?(1)})(?(2)\))$

The solutions is simplified to match only numbers to show in a more clear way what is required if needed.

More Related Contents:

  1. RegEx to remove single quote, parentheses or square bracket from both beginning and end of a string [closed]
  2. How do I match an entire string with a regex?
  3. How to match hyphens with Regular Expression?
  4. Regex.Match whole words
  5. Regex Email validation
  6. How do I replace multiple spaces with a single space in C#?
  7. Replace only some groups with Regex
  8. What’s the difference between “groups” and “captures” in .NET regular expressions?
  9. Best Regular Expression for Email Validation in C#
  10. Regular Expression for password validation
  11. When not to use Regex in C# (or Java, C++, etc.)
  12. Pad left with zeroes
  13. Negating specific characters in regex
  14. Fixed Length Regex Required?
  15. Regex split string but keep separators
  16. RegEx – reusing subexpressions
  17. Regex nested parentheses
  18. Ignoring white space for a Regex match
  19. Validating file types by regular expression
  20. How to make a regex match case insensitive?
  21. How to remove empty lines from a formatted string
  22. Regex for Money
  23. Get values between curly braces c#
  24. Regular expression where part of string must be number between 0-100
  25. Regex to get src value from an img tag
  26. C# Regex to match the word with dot
  27. C# Regex Issue “unrecognized escape sequence”
  28. regex match keywords that are not in quotes
  29. Regex for extracting certain part of a String
  30. C# Regex, Unrecognized escape sequence

Leave a Comment