Introduction To Regular Expressions A regular expression is a special sequence of characters that helps you match or find other strings or sets of strings, using a specialized syntax held in a pattern. Regular expressions are widely used in the UNIX world. example:- Searching date and time in the datasheet, textbook, etc. Regular expressions can contain both special and ordinary characters. they simply match themselves. these are generally made by using meta-characters and repetition qualifiers. Meta Characters are shown below:- Repetition Qualifiers are shown below:- Note:- these are used in text mining and text analysis, etc.
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