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Regular Expression Search

Tool to search (or test) in a text, a message, or a document by regular expression / rational expression and extract matching substrings.

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Regular Expression Search -

Tag(s) : Data processing

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Regular Expression Search

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Regexp Search in a Text

Tool to search (or test) in a text, a message, or a document by regular expression / rational expression and extract matching substrings.

Answers to Questions

What is a regular expression?

A regular expression (or rational expression) is a string that describes a set of other possible strings in a precise syntax, and is used in computing for editing and text control.

Example: a(b|c)[a-z]{3}describes a set of 5 letters beginning with a, followed by b or c and 3 other letters between a and z, in small caps

Example: [0-9]{2}!? describes a set of 2-digit numbers from 00 to 99 followed or not by an exclamation mark

What are the most common regular expressions?

Regular expressions depend heavily on the type of text to be processed:

Lower case name: [a-z0-9_-]{3,16}

Date dd/mm/yyyy: \d{1,2}\/\d{1,2}\/\d{4}

Hexadecimal color: #?([A-Fa-f0-9]){3}(([A-Fa-f0-9]){3})?

E-mail address: [a-z0-9_\.-]+)@([\da-z\.-]+)\.([a-z\.]{2,6}

Internet address:https?:\/\/)?([\da-z\.-]+)\.([a-z\.]{2,6})([\/\w \.-]*)*\/?

IP address: (?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)

What are the best resources for regular expressions?

RegexLib [] A fairly comprehensive library, full of examples.

Regex101 [] : Tester, Online Debugger.

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Source code

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Questions / Comments


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