Commonly Used Regular Expressions

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Commonly Used Regular Expressions

Content	Regular Expression	Description
E-mail address*	\S+@\S+\.\S+	Check for an at (@) sign and dot (.) and allow nonwhite space characters only.
Password	\w+	Any sequence of one or more word characters (letter, space or underscore).
Specific-length password	\w{4,10}	A password that must be atleast four characters long but no longer than ten characters.
Advanced password	[a-zA-Z]\w{3,9}	As with the specific-length password, this regular expression will allow four to ten total characters. The twist is that the first character must fall in the range of a-z or A-Z (this is to say. it must start with a non accented ordinary letter).
Another advanced password	[a-zA-Z]\w*\d+\w*	This password starts with a letter character, followed by zero or more word characters, one or more digits and then zero or more word characters. In short, it forces a password to contain one or more numbers somewhere inside it. You could use a similar pattern to require two numbers or any other special character.