Common Regex

common.regex

http://net.tutsplus.com/tutorials/other/8-regular-expressions-you-should-know/

1. Matching a Username

/^[a-z0-9_-]{3,16}$/

2. Matching a Password

/^[a-z0-9_-]{6,18}$/

3. Matching a Hex Value

/^#?([a-f0-9]{6}|[a-f0-9]{3})$/

4. Matching a Slug

/^[a-z0-9-]+$/

5. Matching an Email

/^([a-z0-9_\.-]+)@([\da-z\.-]+)\.([a-z\.]{2,6})$/

6. Matching a URL

/^(https?:\/\/)?([\da-z\.-]+)\.([a-z\.]{2,6})([\/\w \.-]*)*\/?$/

7. 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]?)$/

8. Matching an HTML Tag

/^<([a-z]+)([^<]+)*(?:>(.*)<\/\1>|\s+\/>)$/