Updated introduction

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Shaun Sandstrom 2022-01-19 14:45:38 -07:00 committed by GitHub
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A regular expression is a pattern that is matched against a subject string from
left to right. Regular expressions are used to replace text within a string,
validating forms, extracting a substring from a string based on a pattern match,
validate forms, extract a substring from a string based on a pattern match,
and so much more. The term "regular expression" is a mouthful, so you will usually
find the term abbreviated to "regex" or "regexp".