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    <p>Have a try with:</p> <pre><code>/^(C\d{4}[a-zA-Z]\d{7}|[a-zA-Z]{2}\d{6}[a-zA-Z]?|\d{9})$/ </code></pre> <p>I suppose that the last alpha is optional in the rule #2</p> <p><strong>explanation:</strong></p> <pre><code>The regular expression: (?-imsx:^(C\d{4}[a-zA-Z]\d{7}|[a-zA-Z]{2}\d{6}[a-zA-Z]?|\d{9})$) matches as follows: NODE EXPLANATION ---------------------------------------------------------------------- (?-imsx: group, but do not capture (case-sensitive) (with ^ and $ matching normally) (with . not matching \n) (matching whitespace and # normally): ---------------------------------------------------------------------- ^ the beginning of the string ---------------------------------------------------------------------- ( group and capture to \1: ---------------------------------------------------------------------- C 'C' ---------------------------------------------------------------------- \d{4} digits (0-9) (4 times) ---------------------------------------------------------------------- [a-zA-Z] any character of: 'a' to 'z', 'A' to 'Z' ---------------------------------------------------------------------- \d{7} digits (0-9) (7 times) ---------------------------------------------------------------------- | OR ---------------------------------------------------------------------- [a-zA-Z]{2} any character of: 'a' to 'z', 'A' to 'Z' (2 times) ---------------------------------------------------------------------- \d{6} digits (0-9) (6 times) ---------------------------------------------------------------------- [a-zA-Z]? any character of: 'a' to 'z', 'A' to 'Z' (optional (matching the most amount possible)) ---------------------------------------------------------------------- | OR ---------------------------------------------------------------------- \d{9} digits (0-9) (9 times) ---------------------------------------------------------------------- ) end of \1 ---------------------------------------------------------------------- $ before an optional \n, and the end of the string ---------------------------------------------------------------------- ) end of grouping ---------------------------------------------------------------------- </code></pre>
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    1. COWOW, thanks so much for this, the detail is awesome and just what I'm looking to learn from. It's getting late here but will let you know how it pans out.
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    2. COThe "|" character/rule/whatever gave me the "lightbulb" moment. thx.
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