Regular Expression named capture group problem

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Old 09 September 2009   #1
Regular Expression named capture group problem
the string i'm trying to match is: "c01_c01_c01dirt"

the regex I am using that works is "([crs][0-9]{2}(dirt)?)_([crs][0-9]{2}(dirt)?)_([crs][0-9]{2}(dirt)?)"
to simplify a bit, I use:
pat = "([crs][0-9]{2}(dirt)?)"
pattern = pat + "_" + pat + "_" + pat
I am trying to use a named capture group to achieve the same result. This is what I came up with:
"(?<a>([crs][0-9]{2}(dirt)?))(_\k<a>){2}"

but for some reason it no longer matches the full string because the optional (dirt)? part seems to be ignored. Any ideas?
 
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Old 09 September 2009   #2
Maybe something like this?

"([crs][0-9]{2})(_\1){2}dirt"


        --test
     pattern = @"([crs][0-9]{2})(_\1){2}dirt"
     regex = dotnetobject "system.text.regularexpressions.regex" pattern
     m = regex.match "c01_c01_c01dirt"
     format "Matched text is [%]" (m.tostring()) 
     format "regex.success == %\n" m.success


EDIT:

Oops, didn't see that "dirt" suffix was optional

Try...
"([crs][0-9]{2})(_\1){2}(dirt)?$"


  pattern = @"([crs][0-9]{2})(_\1){2}(dirt)?$"
  regex = dotnetobject "system.text.regularexpressions.regex" pattern
  m = regex.match "c01_c01_c01dirt"
  format "Matched text is [%]" (m.tostring()) 
  format "regex.success == %\n" m.success
  m = regex.match "c01_c01_c01"
  format "Matched text is [%]" (m.tostring()) 
  format "regex.success == %\n" m.success
  m = regex.match "c01_c01_c01blah"
  format "Matched text is [%]" (m.tostring()) 
  format "regex.success == %\n" m.success
  m = regex.match "c01_c01_c01dirty"
  format "Matched text is [%]" (m.tostring()) 
  format "regex.success == %\n" m.success
Last edited by biddle : 09 September 2009 at 12:39 AM.
 
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Old 09 September 2009   #3
Cheers Mike, works great.
 
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Old 09 September 2009   #4
actually almost as soon as I posted I found out that it doesnt work how I need it to. the dirt part is optional after every c01. so all these would match:
c01_c01_c01
c01dirt_c01_c01
c01_c01_c01dirt
c01dirt_c01dirt_c01dirt
etc...
 
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Old 09 September 2009   #5
Try this one:

([crs][0-9]{2})(dirt)?(_\1(dirt)?){2}$


pattern = @"([crs][0-9]{2})(dirt)?(_\1(dirt)?){2}$"
regex = dotnetobject "system.text.regularexpressions.regex" pattern
  
tests = #(
  "c01_c01_c01dirt",
  "c01_c01dirt_c01",
  "c01dirt_c01_c01dirt",
  "s01_s01_s01",
  "c01_c01_c01blah",
  "c01dir_c01_c01dirt"	
  )

for t in tests do (
  format "\nChecking [%]\n" t
  m = regex.match t
  if m.success then
  (
	format "Matched text is [%]\n" (m.tostring()) 
  )
  else
  (
	  format "No match!\n"
  )
)
 
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Old 09 September 2009   #6
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