This regex will identify all html start and end tags.

Gets year month date hour minute seconds and time zone value yyyy-mm-dd hh:mm:ss UTC $1 $2 $3 $4 $5 $6 $7

RegEx Multiples String seguido de un string fijo

Iranian National Code aka Code Melli

a simple username pattern

validates strings in time format HH:mm with hour in 24h format. only accepts up to 23:59

Validating comma delimited strings for whitespaces & extra commas -- +(,()+){0,}

Checks whether a North American Numbering Plan (NANP) phone number is valid. (Matching numbers are not necessarily real.) However, it registers 299-911-9999 as OK, even though it's not valid.

All Valid: 3334444 222333444 12223334444 333-4444 222-333-4444...

Between two strings.

Awesome explanation of nested lookbacks

Reads C comments as this "/* Do test / and removes / */ parts and leaves only comment part

Matching-Gruppen: Fragenummer Vollständige Frage