C Regex for Guid

Question

I need to parse through a string and add single quotes around each Guid value   I was thinking I could use a Regex to do this but I m not exactly a Regex guru     Is there a good Regex to use to identify a Guid   My second question is once I ve found a valid regex I m assuming I would use Regex Replace String  String  MatchEvaluator  but I m not quite sure of the syntax  Maybe something like   return Regex Replace stringToFindMatch  GuidRegex  match   gt        return string Format    0     match Groups 0  ToString           A string that I m trying to parse may look like this       SELECT                                           passwordco0  PASSWORD CONFIG ID as PASSWORD1 46 0                                         FROM                                           PASSWORD CONFIG passwordco0                                         WHERE                                           passwordco0  PASSWORD CONFIG ID baf04077-a3c0-454b-ac6f-9fec00b8e170                                         p0   baf04077-a3c0-454b-ac6f-9fec00b8e170  Type  Guid  0

User · Accepted Answer

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.

User · Answer

For C   Net to find and replace any guid looking string from the given text   Use this RegEx         a-fA-F0-9  8  -    a-fA-F0-9  4  -    3  a-fA-F0-9  12         Example C  code   var result   Regex Replace        source                 a-fA-F0-9  8  -    a-fA-F0-9  4  -    3  a-fA-F0-9  12                       UUID           RegexOptions IgnoreCase      Surely works  And it matches  amp  replaces the following styles  which are all equivalent and acceptable formats for a GUID    aa761232bd4211cfaacd00aa0057b243    AA761232-BD42-11CF-AACD-00AA0057B243     AA761232-BD42-11CF-AACD-00AA0057B243      AA761232-BD42-11CF-AACD-00AA0057B243

User · Answer

In  NET Framework 4 there is enhancement System Guid structure  These includes new TryParse and TryParseExact methods to Parse GUID  Here is example for this         Generate New GUID     Guid objGuid   Guid NewGuid          Take invalid guid format     string strGUID    aaa-a-a-a-a        Guid newGuid       if  Guid TryParse objGuid ToString    out newGuid     true                Response Write string Format   lt br  gt  0  is Valid GUID    objGuid ToString                else               Response Write string Format   lt br  gt  0  is InValid GUID    objGuid ToString                  Guid newTmpGuid       if  Guid TryParse strGUID  out newTmpGuid     true                Response Write string Format   lt br  gt  0  is Valid GUID    strGUID              else               Response Write string Format   lt br  gt  0  is InValid GUID    strGUID            In this example we create new guid object and also take one string variable which has invalid guid  After that we use TryParse method to validate that both variable has valid guid format or not  By running example you can see that string variable has not valid guid format and it gives message of  InValid guid   If string variable has valid guid than this will return true in TryParse method

User · Answer

You can easily auto-generate the C  code using  http   regexhero net tester     Its free   Here is how I did it     The website then auto-generates the  NET code   string strRegex      b A-F0-9  8    - A-F0-9  4   3 - A-F0-9  12  b   Regex myRegex   new Regex strRegex  RegexOptions None   string strTargetString           CD73FAD2-E226-4715-B6FA-14EDF0764162  Debug x64 ActiveCfg           Debug x64   string strReplace        0      return myRegex Replace strTargetString  strReplace

User · Answer

I use an easier regex pattern    0-9A-Fa-f -  36

User · Answer

Most basic regex is following       0-9A-Fa-f  8  -  0-9A-Fa-f  4  -  0-9A-Fa-f  4  -  0-9A-Fa-f  4  -  0-9A-Fa-f  12        or you could paste it here   Hope this saves you some time

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