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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

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...

ICD9 code pattern

International phone number check - optional country code followed by area code surrounded with '-' or '(' and ')', or just an area code optionally starting with 0, followed by phone numder. The number itself may contain spaces and '-'

Used as a username validation script requires: 1. Allows All Alphanumeric characters & underscore 2. Allows One "@" character 3. Allows Five "." periods 4. Rejects spaces

167 different US telephone patterns. Options includes a)0 or 1 dial, b)area code, c).+-()space between number dial-area code-number.

Simple, but it gave me trouble in the c#...

This regular expression matches 10 digit US Phone numbers in different formats. Some examples are 1)area code in paranthesis. 2)space between different parts of the phone number. 3)no space between different parts of the number. 4)dashes between parts.

This will grep for a valid MAC address , with colons seperating octets. It will ignore strings too short or long, or with invalid characters. It will accept mixed case hexadecimal. Use extended grep.