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Regular Expression Matching Excluded Elements

KGh94

Hello,

I am working with the regular expressions in SKILL, and I'm trying to get the unmatched elements:

myList = '("te_mypattern_xt_1" "text_2" "text_3" "te_mypattern_xt_3" "te_mypattern_xt_3")
exclusionList = rexMatchList("mypattern" myList)
inclusionList = ??

In Python it is possible to use the negate operator "!mypattern", but I don't see something similar in the documentation. Any hints would be appreciated.

Best regards,
Karam

Parents

  • Hi Karam,

    The ancient "rex" functions certainly wouldn't support this, but looking at even the newer pcre (Perl-Compatible Regular Expressions) functions, they don't seem to have an inverted form. It's easy enough to write one though:

    procedure(CCFnegMatchList(pattern lst)
      let(((pat pcreCompile(pattern)))
        setof(elem lst !pcreExecute(pat elem))
      )
    )

    I did it this way rather than just using setof(elem lst !pcreMatchp(pattern elem)) because this way you're compiling the pattern just once, which makes it a more efficient.

    Regards,

    Andrew.

  • in reply to Andrew Beckett

    Thanks Andrew. What's the difference between pcreMatchp and rexMatchp?

    Best regards,
    Karam

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