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Regular expression for validating web site url

What if instead of foo you wanted to find all words starting with the letter f, or all three letter words?

Regular expression for validating web site url Sexi hookups

In addition to the non-explicit quantifiers (generally just referred to as quantifiers, but I'm distinguishing them from this next group), there are also quantifiers.

Credit for the first regular expressions is given to the mathematician Stephen Kleene.

Eventually, Ken Thompson built support for regular expressions into qed and grep, both very popular text utilities.

The easiest and safest way to check whether an email address is well-formed is to use PHP's filter_var() function.

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