Scribd
Upload
20 views1 page

Regular Expressions Identify A String

Regular expressions use special characters called metacharacters to define patterns that text can match. Each character in a regular expression is either a metacharacter that represents a class of characters or a regular character that matches literally. For example, the regex "a." matches "a" followed by any single character except a newline. Regular expressions can identify strings within other strings, replace strings, and split strings into chunks. They are used widely in search engines, text editors, programming languages, and other tools for text processing and analysis.

Uploaded by

Utkarsh Krishak
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
20 views1 page

Regular Expressions Identify A String

Regular expressions use special characters called metacharacters to define patterns that text can match. Each character in a regular expression is either a metacharacter that represents a class of characters or a regular character that matches literally. For example, the regex "a." matches "a" followed by any single character except a newline. Regular expressions can identify strings within other strings, replace strings, and split strings into chunks. They are used widely in search engines, text editors, programming languages, and other tools for text processing and analysis.

Uploaded by

Utkarsh Krishak
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
You are on page 1/ 1

REGULAR EXPRESSIONS IDENTIFY A STRING

The phrase regular expressions (and consequently, regexes) is often used to


mean the specific, standard textual syntax (distinct from the mathematical
notation described below) for representing patterns that matching text need to
conform to. Each character in a regular expression (that is, each character in the
string describing its pattern) is understood to be a metacharacter (with its
special meaning), or a regular character (with its literal meaning). For example,
in the regex a. a is a literal character which matches just 'a' and . is a meta
character which matches every character except a newline. Therefore, this regex
would match for example 'a ' or 'ax' or 'a0'. Together, metacharacters and literal
characters can be used to identify textual material of a given pattern, or process
a number of instances of it. Using regular expression you can search a particular
string inside a another string, you can replace one string by another string and
you can split a string into many chunks.
Regular expressions are used in search engines, search and replace dialogs of
word processors and text editors, in text processing utilities such as sed and
AWK and in lexical analysis. Many programming languages provide regex
capabilities, built-in, or via libraries.

You might also like