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| | www.regular-expressions.info

In a regular expression, parentheses can be used to group regex tokens together and for creating backreferences. Backreferences allow you to reuse part of the regex match in the regex, or in the replacement text.
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| | www.cplusplus.com

[AI summary] The text provides an overview of regular expression syntax and its special characters, quantifiers, groups, assertions, and character classes, primarily focusing on ECMAScript syntax standards.
3.1 parsecs

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| | github.com

Learn regex the easy way. Contribute to ziishaned/learn-regex development by creating an account on GitHub.
2.4 parsecs

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| | github.com

Proposal to add support for sequence properties in Unicode property escapes to ECMAScript regular expressions. - tc39/proposal-regexp-unicode-sequence-properties
21.0 parsecs

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