Takes a JSON string and captures interesting information in the named capturing groups: (o: last object, a: last array, s: last string, n: last number, c: last comma before optional whitespace, d: same as c, but with a colon instead of a comma, v: last value)

Validates IPv4 IP Address

Matches email with groups for username and domain.

I've looked at some of the other IP matching that seems a lot more complex but several of them don't work, and I'm too simple minded to figure out why. Keep it simple, I've never had a problem matching IP addresses in logs with this one.

Validates input to match UK Date Time standard

matches the exact fields of CSV files supports: qouted fields quoted fields containing commas, doubble quoutes, and newlines empty fields empty records arbitrary white space in, and outside quoted fields

12

Validate an ivoice number with the last two digit as last 2 year digit

Matches all the RGB colors in the format #RRGGBB and #RGB

How to match the first line of a xml document