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Updated introduction
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A regular expression is a pattern that is matched against a subject string from
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A regular expression is a pattern that is matched against a subject string from
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left to right. Regular expressions are used to replace text within a string,
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left to right. Regular expressions are used to replace text within a string,
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validating forms, extracting a substring from a string based on a pattern match,
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validate forms, extract a substring from a string based on a pattern match,
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and so much more. The term "regular expression" is a mouthful, so you will usually
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and so much more. The term "regular expression" is a mouthful, so you will usually
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find the term abbreviated to "regex" or "regexp".
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find the term abbreviated to "regex" or "regexp".
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