# Regular expression basics | Top Previous Next

Regular expressions use special characters (also known as regular expression operators) to specify rules for strings. A summary of these characters are: ^ Beginning of string $ End of string . Any character [ Start of character list ] End of character list ( Start of expression group ) End of expression group | ORs two expressions \ Escape character * Preceding expression occurs zero or more times ? Preceding expression occurs zero or one times + Preceding expression occurs one or more times { Start of bounded repeat } End of bounded repeat

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