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Finds sentences (assuming they end with a full stop, question mark or exclamation mark).

Any Expression Upper/Lower Case, with commas and space between the text, with any amount of space before or after

UK National Insurance Number (NINo) validation. The following modifications have been made: The first letter may not be D, F, I, Q, U or Z; the second letter may not be D, F, I, O, Q, U or Z; the final letter is optional.

This regex can be used to restrict passwords to a length of 8 to 20 aplhanumeric characters and select special characters. The password also can not start with a digit, underscore or special character and must contain at least one digit.

Validate against any diner's club card. All diner club cards start with 30,36, or 38, followed by 12 other numbers.

UK National Insurance (NI) Number, updated 14 Dec 2005 and current for 2006.

Spam stopper, catches any non english characters for u used in flocks

This regex validates U.S. social security numbers, within the range of numbers that have been currently allocated.

Additional checks for <> and " characters

UK vehicle registration system prior to September 2001. Allows both older suffix and the later prefix formats in simple form, with optional spaces.

matches any string with characters repeated more than twice, sometimes used as fake input

Matchs comma delimited numbers. Easily changed to allow for other delimiters. (Edit ",") Does not allow a leading 0 Does not allow groups of numbers with less than 3 numbers, exculding the first group.

Well it pretty much accepts all kinds of users, about the domain i didn't write it special for any TLD so there's no length defined, ohh and it accepts some IDN stuff

I built this expression to test a string in ASP for valid username and password constraints. It can be adapted for any number of scenerios. For instance in this case, we needed to ensure the username someone wanted was not all numbers or all letters and was 6-15 characters in length with no special characters. This expression tests negatively for all number cases, then all letter cases, and lastly tests for only alphanumeric characters in the required range. In other words: the match must be alphanumeric with at least one number, one letter, and be between 6-15 character in length.

"Starts with but does not end with." I needed a pattern to require certain first (and optional middle) names, but to fail for certain last names. So if Bob, John, and Mary are acceptable first names but the White's are always rejected then...

returns string between two quotes

RAR file extensions. Works also with '*.part01.rar' given '.rar' to be the file extension. Does not support volumes exceed 101 for s## (r99, s00, s01, ...) serie.

This pattern captures <lastname><suffix>,<prefix><firstname><mname> Names must start with a capital letter. Last names may be hyphenated. First names can have two parts ie "Mary Anne" if there are more than two names after the comma. Suffixes can number up to XXX (30th). Standard prefixes are optional (Mr Miss)

Validate against any discover card number. All DC's start with 6011 and are followed by 12 other numbers.

Trim Inside. This pattern can be used with a replace value of "$1 " to remove multiple consecutive spaces between characters and replace with a single space. Trailing and leading spaces are NOT altered.