I want to know the General formula for Writing Regular Expression? Any article?
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I want to know the General formula for Writing Regular Expression? Any article?
There isn’t really a general formula. Regex is a non-trivial language for matching strings. There are plenty of books and tutorials available.
One of the better ways of learning regex is to use a piece of regex designer software, like this one.
Regexes for emails are tricky, but there are some good ones here: http://regexlib.com/DisplayPatterns.aspx