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

ex : udinkomarudin.png

a

justtesting

justtesting

$ 100.00 USD