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Regex Pattern Matching

  1. #1
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    Regex Pattern Matching

    Hi folks,

    I'm well acquainted with pattern matching using the str functions in VBA.

    I'm wondering, however, about the viability of using regex matches instead when running through multiple ranges for the same pattern.

    I'm VERY green with regex so please forgive my ignorance - if I wanted to match the following, how would it be done?

    -Length must be 10 characters
    - First 4 characters are letters only (no numbers)
    - IF the length is not 10 digits, insert a 0 AFTER the first 4 letters for every missing digit

    i.e. if I had ABCD01234 -> ABCD001234
    DCBA87623 -> DCBA087623
    WXYZ2354 -> WXYZ002354

    What would this look like?

    Thanks in advance.
    never stop learning. or milk

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    Re: Regex Pattern Matching

    Hello visualnotsobasic,

    Here is a macro that checks the string for 4 alpha characters (case is ignored) and then must be followed by 1 to 6 digits. Additional leading zeros are added if there are less than 6 digits.

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    Re: Regex Pattern Matching

    Hi Leith,

    Sorry for my late reply!
    It looks fantastic, but I for some reason can not figure out how to get it to run on a specific range.

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    Re: Regex Pattern Matching

    Maybe just to clarify a bit more - if I have a named range, how do I run the regex match and replace it with the proper string on each cell?

    I apologize for my ignorance. I'm very new to this and I've been fooling around with your code for a few hours, but I can't seem to get it to do anything.

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    Re: Regex Pattern Matching

    Hiya, I believe this should work for you.. (Borrowing from Leith)

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    Re: Regex Pattern Matching

    Hello visualnotsobasic,

    Since you did not say how many cells there were, I optimized the code for speed and a large data set. Add a new standard VBA module to your workbook then copy and paste the code below into it. Be sure to change the name of the named range in the macro "Test" before you run the macro.

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    Re: Regex Pattern Matching

    Absolutely brilliant on the parts of both of you, thank you!

    As an aside, would you mind explaining how that replace function works?

  8. #8
    Forum Moderator Leith Ross's Avatar
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    Re: Regex Pattern Matching

    Hello visualnotsobasic,

    The RegEx replace method, replaces the old text with the new text. A shorthand for referencing a submatch is to use the dollar sign prefix in front of submatch's position. Thus, "$1"indicates the first submatch in the pattern, the four letters. This is concatenated with the second submatch, the numbers, after the numbers are converted from a string to a value and back to string with the required number of zeroes added in.

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