Capturing subgroups of a text wave or string list

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Sat, 06/20/2015 - 10:19 am

Hello!

Say I have a wave or a string like:

String mStr = "foo24,bar,foo,foo35"
Make /O/T mWave = {"foo24","bar","foo","foo35"}


Is there any igor function to extract the *groups* from a regex, instead of just the matching elements (like Grep)? For example, with strings

 
String mRegex = "(foo\d)"
String capturedGroups
// the following  'magic function'would put "foo2,foo3" in capturedGroups. In other words, the actual group that matched
GetGroups /E=(mRegex) mStr,capturedGroups


I ask because my alternative is calling SplitString on each of the elements of the string list or text wave, which is prohibitively expensive and slow in my experience. Thanks!
This might give you some ideas:
static Function Select(str)
    String str
    String tmp = str[0,2]
    if (CmpStr(tmp,"foo") == 0)
        return 1
    endif
    return 0
End

Function Demo()
    Make /O/T mWave = {"foo24","bar","foo","foo35"}
    Wave/T mWave = root:mWave
    Extract /O mWave, destWave, Select(mWave)
End

June 21, 2015 at 07:30 am - Permalink