This can be changed to find all characters upto a specific pattern as well by changing the \b at the start to a simple ^. This is useful if you want to limit your regex searches in a manner such that two pattern cases do not overlap (as regex does not currently handle overlap of cases when you cha...

Finds any date in UK date format with or without century and allows for month names and abreviations as well as ordinal indicators (st, nd, rd, th) This expression uses look behind and look ahead to ensure the date is either at the start of a line or preceeded by whitspace.

Matches all standard UK postcodes whether partial (outward) or full (outward and inward), spaces optional. To enforce spaces remove the ? after (?:\s). There are a few letters not currently in use, this test does not seek to exclude them. The only known postcode this will not validate for is GIR 0A...

Regex Matching ISO format

This is an adapted version of the regex writen at the book Mastering Reguar Expressions.

This regex enforces the correct basic structure whilst only allowing permitted characters (RFC822) in both the local and domain parts. It permits + routing made popular by Gmail and allows for the + group to identified as routing. It allows all but the most extreme of valid email addresses i.e. "@" ...