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What is a regex?

What is a regex? Here are some definitions.

Noun
  1. (computing) Abbreviation of regular expression.
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But see the section below on configuration merging to find out how using regex sections will change how directives are applied.
I got the script to work, including a complicated regex that worked on the first try.
In the « Replace regex » field, we put the path to the local folder from which the images will be selected to be displayed as wallpapers.
Using a computer syntax called regex, for regular expressions, I had written a filter that recognized any of an infinite number of such patterns.
Stating a regex in terms of what you don't want to match is a bit harder.
Often abbreviated as regex, a regular expression is a string of characters that describes one or more matching strings.

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