Regular Expression -Introduction

  

                   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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