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→KEY CONCEPTS
= KEY CONCEPTS =
<i>A '''regular expression''' … is a sequence of characters that define a search pattern.<br>Usually such patterns are used by string searching algorithms for "find" or <br>"find and replace" operations<br>on strings, or for input validation. </i><br>Reference: https://en.wikipedia.org/wiki/Regular_expression
===Regular Expressions vs. Filename Expansion===