There is no single standard that defines what regular expressions must and must not do, so this Refcard does not cover every regex version or ‘flavor’.  Parts of this Refcard will apply to some flavors (for example, PHP and Perl), while the same syntax will throw parse errors with other flavors.

Contents Include:

• About Regular Expressions
• Advanced Features
• The Dot Operator
• Quantifiers
• Flags
• Character Classes … and more!

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