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href="http://net.tutsplus.com/tutorials/other/8-regular-expressions-you-should-know/%20
Matching a username
/^[a-z0-9_-]{3,16}$/
String that matches: my-us3r_n4m3
String that doesn't match: th1s1s-wayt00_l0ngt0beausername (too long)
Matching a Password
/^[a-z0-9_-]{6,18}$/String that matches: myp4ssw0rd
String that doesn't match: mypa$$w0rd (contains a dollar sign)
Matching a Hex Value
/^#?([a-f0-9]{6}|[a-f0-9]{3})$/String that matches:
#a3c113
String that doesn't match:
#4d82h4 (contains the letter h)
Matching a Slug
/^[a-z0-9-]+$/String that matches:
my-title-here
String that doesn't match:
my_title_here (contains underscores)
Matching an Email
/^([a-z0-9_\.-]+)@([\da-z\.-]+)\.([a-z\.]{2,6})$/String that matches:
john@doe.com
String that doesn't match:
john@doe.something (TLD is too long)
Matching a URL
/^(https?:\/\/)?([\da-z\.-]+)\.([a-z\.]{2,6})([\/\w \.-]*)*\/?$/String that matches:
http://net.tutsplus.com/about
String that doesn't match:
http://google.com/some/file!.html (contains an exclamation point)
Matching an IP Address
/^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/String that matches:
73.60.124.136 (no, that is not my IP address :P)
String that doesn't match:
256.60.124.136 (the first group must be "25" and a number between zero and five)
Matching an HTML Tag
/^<([a-z]+)([^<]+)*(?:>(.*)<\/\1>|\s+\/>)$/String that matches:
String that doesn't match:
" /> (attributes can't contain greater than signs)
