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Regular Expressions - Cant use | as or in group?

Hello!

So I am trying to use the rexMatchp to match with certain words. For example, here I am trying to match the word "dog" with the expression "cat or dog" but the function returns nil. I have tried the following:

rexMatchp("cat|dog" "dog")
nil

rexMatchp("(cat|dog)" "dog")
nil

rexMatchp("\(cat|dog\)" "dog")
nil

rexMatchp("\\(cat|dog\\)" "dog")
nil

rexMatchp("\\(cat\|dog\\)" "dog")
nil

rexMatchp("\(cat\|dog\)" "dog")
nil

After reading the manual it seems that the | operator is not included?

So my question is then, is there another way that I can implement the regular expression to give the wanted functionality?

Parents

Andrew Beckett over 4 years ago

I suggest you use the pcre functions instead - these are the Perl Compatible Regular Expressions - pcreMatchp is the equivalent function. This has an extremely rich syntax (it's compatible with that used in perl, as the name suggests).

pcreMatchp("cat|dog" "dog")

will do what you want.

Andrew
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Andrew Beckett over 4 years ago

I suggest you use the pcre functions instead - these are the Perl Compatible Regular Expressions - pcreMatchp is the equivalent function. This has an extremely rich syntax (it's compatible with that used in perl, as the name suggests).

pcreMatchp("cat|dog" "dog")

will do what you want.

Andrew
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Andrew Beckett over 4 years ago in reply to Andrew Beckett

I meant to say that the "rex" functions are ancient - and very limited - and only preserved for compabitlity with older releases. PCRE was introduced in IC6.1.0 (if my memory is correct) back in 2006.

Andrew.
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PontusT over 4 years ago in reply to Andrew Beckett

Okay so what I originally intended to do was to make this regex expression and use in psf like this:

psf -i tran.tran.tran -o tran.output -e "(vout|vin)"

but then that is not possible?
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Andrew Beckett over 4 years ago in reply to PontusT

I'm not really sure what that has to do with either the SKILL function rexMatchp or pcreMatchp? According to the help, it supports "regex" but as far as I can see that's just "basic" regular expressions and so also doesn't support the pipe for or-ing.

I don't believe there have been any requests for improving that (especially as the "psf" command is only used for limited debugging, and only supports the psfbin/psfascii/psfbinf formats).

Andrew
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PontusT over 4 years ago in reply to Andrew Beckett

Well I assumed that the rexMatchp would be the same matching as the one that was used in psf. Okay thanks for your reply :)
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