match a single number

super

Only if needle is before target

Very simple validation expression that will validate a date in the range of 19000101 through 20991231. These formats are very popular for partitioning and representing dates as Long values or Integers. This does not check for Leap year values, or the months with varying number of days. Please Note:...

Run in notepad++, replace with \u$1

It will match if it's present only the exact word in a phrase, without any other words in the same sentence

This is from "Learning the Vi editor", chapter 6 page 96

REGEX per il progetto di tecnologie web

first groups all white space $1 second groups all first letter of every word except capitals third groups remaining letters

f

cert regex

A good enough approximation to IPv6 based on the examples at https://www.ibm.com/docs/en/ts3500-tape-library?topic=functionality-ipv4-ipv6-address-formats

IBAN SPAIN WITH SPACES. ES12 1234 4567 8975 4662 (THIS IS AN EXAMPLE)

chingo de cheves y desmadre

Spotify ID regex

it took me quite some time to figure out. I hope it'll be helful to someone else.

helix word motion

Kafka topic name regex

https://regex101.com/r/VrZHR8/1

You can easily extract YouTube IDs, excluding the paths and parameters.