Checks for valid UK/British postcodes. A modified version of MaffooBristol's pattern that prevents a non-whitespace character being entered in between the two sections of the postcode. Works in PHP/JS ...

This is a Regex to the Whatsapp chat data. This parses the G1 - Date, G2 - Time, G3 - User, G4 - Qualifier & G5 - Actual chat data. The Qualifier (G4) identifies the group Creation information, : that separates the User and Ping chat data and New user added chats.

Match numerical value of a JSON key. Numbers only 3-9

Convert .5 in all its forms to 1/2

A regex to parse WhatsApp conversation files

Recognizes time-of-day timestamps Time range is from 0:00:00 through 23:59:59 Seconds are optional Named match components for hours, minutes, seconds

for catching phone generated message such as "sent from my"

1112223333

A good enough, nonrigorous expression

See email.

Valid windows file name.

Match an IPv4 address and its description delimited by a 'newline' paragraph

Email validation according to RFC standards

Verify if the given text is a version tag, like git tags for versions in the git flow method

Negative Lookahead Sample