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search for pattern in a string

greywanderer

Hi,

How do you search for a pattern in a string and return the pattern found?

For eg. say the string "/a/b/c/Interactive.123/d/e/"

And regex pattern is "Interactive.[0-9]+".

Is there a skill function that returns "Interactive.123" when function("/a/b/c/Interactive.123/d/e/" "Interactive.[0-9]+")?

Thanks!

  • Hi,

    str = "/a/b/c/Interactive.123/d/e/"
    => "/a/b/c/Interactive.123/d/e/"
    pat = pcreCompile("(Interactive\\.[0-9]+)")
    => pcreobj@0x2aa37260
    pcreExecute(pat str)
    => t
    pcreSubstitute(pat "\\1")
    => "Interactive.123"

    The "." in the pattern needed to be escaped otherwise it means 'any single character' rather than a literal dot. The whole captured pattern is surrounded with parentheses, and since this is the first captured pattern it is referred to as \\1 in the replacement, this is what the pcreSubstitute function is returning to us, the first captured (sub)-pattern.

    Best regards,

    Lawrence.

  • in reply to skillUser

    You can get the actual match also with \\0. This does not require an explicit capture group around the whole pattern, e.g. pcreCompile("Interactive\\.[0-9]+") without the capture parentesis in the regex and pcreSubstitute(pat "\\0") will do the same and may be a bit more intuitive.

  • in reply to henker

    In addition to \\0 you can also use & - so:

    pcreSubstitute(pat "&") 

    will do the same thing. Of course, your pattern could also be "Interactive\\.\\d+" (\d is perl regular expression for a digit).

    Andrew

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