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8886 :: To insert regex pattern into another

• mardiyah (orginal) [2022-02-09T14:58:09+01:00] view original

  How do we insert regex pattern into another, e.g. by sort of Perl's way:

  let word= re"[a-z]w*" let num= re"d*"

  let wordNum= re"[a-z]w*$num"

  Please guide to the correct simple one

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• auxym (orginal) [2022-02-09T15:14:25+01:00] view original

  I assume you are using the "regex" nimble package? If so you can assemble the pattern string as you wish (concatenation, using the std/strformat package, etc), then use the "re" function to compile it to a regex object (possibly at compile-time if you pass in a static string): https://nitely.github.io/nim-regex/regex.html#re%2Cstaticstring

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• PMunch (orginal) [2022-02-09T15:39:11+01:00] view original

  Something along the lines of:

  let
    wordPattern = r"[a-z]\w*"
    numPattern = r"\d*"
    word = re(wordPattern)
    num = re(numPattern)
    wordNum= re(r"[a-z]\w*" & numPattern)
  Run

  This is because the re function returns an already compiled regex, so you can't really insert more things into it. So you need to keep the patterns strings and the compiled regexes separate. Note that the r prefix is required for the strings, this means they are raw string literals so that e.g. \n won't be read as a newline.

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