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    <p>I could still work with it. I'd just use <a href="http://sourceforge.net/projects/regulator/" rel="nofollow noreferrer">Regulator</a>. One thing it allows you to do is save the regex along with test data for it.</p> <p>Of course, I might also add comments.</p> <hr> <p>Here's what Expresso produced. I had never used it before, but now, Regulator is out of a job:</p> <pre> // using System.Text.RegularExpressions; /// /// Regular expression built for C# on: Thu, Apr 2, 2009, 12:51:56 AM /// Using Expresso Version: 3.0.3276, http://www.ultrapico.com /// /// A description of the regular expression: /// /// Select from 3 alternatives /// ^(?:(?:(?:0?[13578]|1[02])(\/|-|\.)31)\1|(?:(?:0?[13-9]|1[0-2])(\/|-|\.)(?:29|30)\2))(?:(?:1[6-9]|[2-9]\d)?\d{2})$ /// Beginning of line or string /// Match expression but don't capture it. [(?:(?:0?[13578]|1[02])(\/|-|\.)31)\1|(?:(?:0?[13-9]|1[0-2])(\/|-|\.)(?:29|30)\2)] /// Select from 2 alternatives /// (?:(?:0?[13578]|1[02])(\/|-|\.)31)\1 /// Match expression but don't capture it. [(?:0?[13578]|1[02])(\/|-|\.)31] /// (?:0?[13578]|1[02])(\/|-|\.)31 /// Match expression but don't capture it. [0?[13578]|1[02]] /// Select from 2 alternatives /// 0?[13578] /// 0, zero or one repetitions /// Any character in this class: [13578] /// 1[02] /// 1 /// Any character in this class: [02] /// [1]: A numbered capture group. [\/|-|\.] /// Select from 3 alternatives /// Literal / /// - /// Literal . /// 31 /// Backreference to capture number: 1 /// (?:(?:0?[13-9]|1[0-2])(\/|-|\.)(?:29|30)\2) /// Return /// New line /// Match expression but don't capture it. [(?:0?[13-9]|1[0-2])(\/|-|\.)(?:29|30)\2] /// (?:0?[13-9]|1[0-2])(\/|-|\.)(?:29|30)\2 /// Match expression but don't capture it. [0?[13-9]|1[0-2]] /// Select from 2 alternatives /// 0?[13-9] /// 0, zero or one repetitions /// Any character in this class: [13-9] /// 1[0-2] /// 1 /// Any character in this class: [0-2] /// [2]: A numbered capture group. [\/|-|\.] /// Select from 3 alternatives /// Literal / /// - /// Literal . /// Match expression but don't capture it. [29|30] /// Select from 2 alternatives /// 29 /// 29 /// 30 /// 30 /// Backreference to capture number: 2 /// Return /// New line /// Match expression but don't capture it. [(?:1[6-9]|[2-9]\d)?\d{2}] /// (?:1[6-9]|[2-9]\d)?\d{2} /// Match expression but don't capture it. [1[6-9]|[2-9]\d], zero or one repetitions /// Select from 2 alternatives /// 1[6-9] /// 1 /// Any character in this class: [6-9] /// [2-9]\d /// Any character in this class: [2-9] /// Any digit /// Any digit, exactly 2 repetitions /// End of line or string /// ^(?:0?2(\/|-|\.)29\3(?:(?:(?:1[6-9]|[2-9]\d)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00))))$ /// Beginning of line or string /// Match expression but don't capture it. [0?2(\/|-|\.)29\3(?:(?:(?:1[6-9]|[2-9]\d)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00)))] /// 0?2(\/|-|\.)29\3(?:(?:(?:1[6-9]|[2-9]\d)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00))) /// 0, zero or one repetitions2 /// [3]: A numbered capture group. [\/|-|\.] /// Select from 3 alternatives /// Literal / /// - /// Literal . /// 29 /// Backreference to capture number: 3 /// Match expression but don't capture it. [(?:(?:1[6-9]|[2-9]\d)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00))] /// Match expression but don't capture it. [(?:1[6-9]|[2-9]\d)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00)] /// Select from 2 alternatives /// (?:1[6-9]|[2-9]\d)?(?:0[48]|[2468][048]|[13579][26]) /// Match expression but don't capture it. [1[6-9]|[2-9]\d], zero or one repetitions /// Select from 2 alternatives /// 1[6-9] /// 1 /// Any character in this class: [6-9] /// [2-9]\d /// Any character in this class: [2-9] /// Any digit /// Match expression but don't capture it. [0[48]|[2468][048]|[13579][26]] /// Select from 3 alternatives /// 0[48] /// 0 /// Any character in this class: [48] /// [2468][048] /// Any character in this class: [2468] /// Any character in this class: [048] /// [13579][26] /// Any character in this class: [13579] /// Any character in this class: [26] /// (?:(?:16|[2468][048]|[3579][26])00) /// Return /// New line /// Match expression but don't capture it. [(?:16|[2468][048]|[3579][26])00] /// (?:16|[2468][048]|[3579][26])00 /// Match expression but don't capture it. [16|[2468][048]|[3579][26]] /// Select from 3 alternatives /// 16 /// 16 /// [2468][048] /// Any character in this class: [2468] /// Any character in this class: [048] /// [3579][26] /// Any character in this class: [3579] /// Any character in this class: [26] /// 00 /// End of line or string /// ^(?:(?:0?[1-9])|(?:1[0-2]))(\/|-|\.)(?:0?[1-9]|1\d|2[0-8])\4(?:(?:1[6-9]|[2-9]\d)?\d{2})$ /// Beginning of line or string /// Match expression but don't capture it. [(?:0?[1-9])|(?:1[0-2])] /// Select from 2 alternatives /// Match expression but don't capture it. [0?[1-9]] /// 0?[1-9] /// 0, zero or one repetitions /// Any character in this class: [1-9] /// Match expression but don't capture it. [1[0-2]] /// 1[0-2] /// 1 /// Any character in this class: [0-2] /// Return /// New line /// [4]: A numbered capture group. [\/|-|\.] /// Select from 3 alternatives /// Literal / /// - /// Literal . /// Match expression but don't capture it. [0?[1-9]|1\d|2[0-8]] /// Select from 3 alternatives /// 0?[1-9] /// 0, zero or one repetitions /// Any character in this class: [1-9] /// 1\d /// 1 /// Any digit /// 2[0-8] /// 2 /// Any character in this class: [0-8] /// Backreference to capture number: 4 /// Match expression but don't capture it. [(?:1[6-9]|[2-9]\d)?\d{2}] /// (?:1[6-9]|[2-9]\d)?\d{2} /// Match expression but don't capture it. [1[6-9]|[2-9]\d], zero or one repetitions /// Select from 2 alternatives /// 1[6-9] /// 1 /// Any character in this class: [6-9] /// [2-9]\d /// Any character in this class: [2-9] /// Any digit /// Any digit, exactly 2 repetitions /// End of line or string /// /// /// public static Regex regex = new Regex( "^(?:(?:(?:0?[13578]|1[02])(\\/|-|\\.)31)\\1|\r\n(?:(?:0?[13-9]"+ "|1[0-2])(\\/|-|\\.)(?:29|30)\\2))\r\n(?:(?:1[6-9]|[2-9]\\d)?\\d"+ "{2})$|^(?:0?2(\\/|-|\\.)29\\3(?:(?:(?:1[6-9]|[2-9]\\d)?(?:0["+ "48]|[2468][048]|[13579][26])|\r\n(?:(?:16|[2468][048]|[3579][2"+ "6])00))))$|^(?:(?:0?[1-9])|(?:1[0-2]))\r\n(\\/|-|\\.)(?:0?[1-9"+ "]|1\\d|2[0-8])\\4(?:(?:1[6-9]|[2-9]\\d)?\\d{2})$", RegexOptions.CultureInvariant | RegexOptions.Compiled ); </pre>
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    1. POHow do I write more maintainable regular expressions?
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    1. USJohn Saunders
    1. USJohn Saunders
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    1. COIt would be interesting to see what this tool comes up with for the example RE in the question. I was going to try but I couldn't be bothered downloading and installing. Do you want to give it a shot?
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    2. COI tried real quick. It doesn't like it much, at least not in the analyzer. It parsed ok. What's it meant to match?
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      1. USJohn Saunders
    3. COexacly you have a bug in it... what do you do?!?!?!
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