RegExLib.com - The first Regular Expression Library on the Web!

Validates a GUID with and without brackets. 8,4,4,4,12 hex characters seperated by dashes.

Matches UK postcodes according to the following rules 1. LN NLL eg N1 1AA 2. LLN NLL eg SW4 0QL 3. LNN NLL eg M23 4PJ 4. LLNN NLL eg WS14 0JT 5. LLNL NLL eg SW1N 4TB 6. LNL NLL eg W1C 8LQ. Modifications: 1) Doesn't allow leading zeros in first part (outward) eg BT01 3RT is incorrect; it should be BT1 3RT. 2) Only allows uppercase letters, which is the preference of the UK Post Office. 3) Permits the only postcode to break the rules - GIR 0AA (for the old Girobank, now Alliance & Leicester bank, address)

This will match results in a template situation. For example: template reads Dear @@Name@@, .... would become Dear John, If you dont want to use the @@ change the @ to what ever characters you want.

It checks for Valid US Phone numbers. Accepts ".",Space,\,/,- as delim.

This pattern returns the font section from an RTF document. The first parenthetical subexpression captures the font number, the second returns the actual font enumeration. Lame-o, but fun! :-)

Will locate an URL in a webpage. It'll search in 2 ways - first it will try to locate a href=, and then go to the end of the link. If there is nu href=, it will search for the end of the file instead (.asp, .htm and so on), and then take the data between the "xxxxxx" or 'xxxxxx'

This expression will match the corresponding XML/HTML elements opening and closing tags. Useful to handle documents fragments, without loading an XML DOM.

USA Alhpanumeric Valid Phone numbers

simple expression for excluding a given list of characters. simply change the contents of [^] to suite your needs. for example ^(/w|/W|[^<>])+$ would allow everything except the characters < and >.

Valida os todos Estados Brasileiros (UF) e o distrito Federal

Postcode check for Spain

Usesful for importing vcards. Matches vcard elements and values.

Regexp to find all external links in a HTML string. Can easily be modified to handle all/other links/protocols (like file/https/ftp). Uses lookahead assertions and non-greedy modifier to check for the end </a> but still allow html tags inbetween start and end A tag. Takes into account that there could be linebreaks and other nasty whitespace chars in the middle of the tag. I am using it to find all external links in embedded HTML code and change 1.the target of the link 2.insert a "Leaving Site" logo to illustrate you are leaving site.

This one matches all strings that do not contain the single quotation mark (').

Host/Domain name validation for perl. Should be combined with a check for length <= 63 characters and that $2 is in a list of top-level domains.

I wrote this sweet little (well, not so little really) reg to extract links from an HTML source.... it is very robust, give it a try. The only limitation I have discovered is that it can't match invalid HTML...

Matches HTML image leaf filenames.

Regular expression to match valid UK postcodes. In the UK postal system not all letters are used in all positions (the same with vehicle registration plates) and there are various rules to govern this. This regex takes into account those rules. Details of the rules: First half of postcode Valid formats [A-Z][A-Z][0-9][A-Z] [A-Z][A-Z][0-9][0-9] [A-Z][0-9][0-9] [A-Z][A-Z][0-9] [A-Z][A-Z][A-Z] [A-Z][0-9][A-Z] [A-Z][0-9] Exceptions Position - First. Contraint - QVX not used Position - Second. Contraint - IJZ not used except in GIR 0AA Position - Third. Constraint - AEHMNPRTVXY only used Position - Forth. Contraint - ABEHMNPRVWXY Second half of postcode Valid formats [0-9][A-Z][A-Z] Exceptions Position - Second and Third. Contraint - CIKMOV not used

Matches tags