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When searching a text online we often need to find sequences matching some pattern rather than a particular fixed word.
This can be achieved through the use of regular expressions. These help us filter through all the words we might not want to find the ones we do.
An on-line description of regular expressions is available here:

Here are some exercises that test your ability to use regular expressions.
Regex tutorial

Don't know REGEX? Don't worry! Here you can learn all the basics you will need.

Regex exercises

This page contains exercises for REGEX.