If I have a field that is valid if either it is blank or matches a regular expression (For example: \d{10}), how would I write a regular expression that would match any valid input?<BR><BR>(In other ...
How do you find out if a user has entered a valid email address? Do you check for an at-sign, or is it more complicated? For many developers the answer is a regular expression, a little bit of code ...
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