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Please look at this question.

The OP choosed the title Why my Regex let me write “,” (Comma)? in belief that there is some exception for comma in his Regex, but the real problem was different. Should I rename it to something like Regex character set syntax to make it clear for others, or should I leave it as is, not to confuse the OP?

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  • Meh, I'd probably leave it. It's a part of the category of changes in which you're editing the question as a result of finding the answer. While you sometimes can, it makes a lot of people wary. Searching for dups now.
    – Servy
    Commented May 21, 2013 at 17:15
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    The title is correct: The OP is wondering why the regular expression he used allows the comma as input. The title you suggest is a rather generic title that could be used for many questions about regular expressions.
    – apaderno
    Commented May 21, 2013 at 18:37

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