reWhitespace

Regular expression to match a white space character.

Installation

npm install @stdlib/regexp-whitespace

Usage

var reWhitespace = require( '@stdlib/regexp-whitespace' );

reWhitespace( [options] )

Returns a regular expression to match a white space character.

var RE_WHITESPACE = reWhitespace();

var bool = RE_WHITESPACE.test( '\n' );
// returns true

bool = RE_WHITESPACE.test( ' ' );
// returns true

The function accepts an options object with optional properties:

• flags: string specifying regular expression flags. Default: ''.
• capture: boolean indicating whether to create a capture group for the match. Default: false.

By default, the function returns a regular expression which does not have any flags specified. To specify flags, set the flags option with a list of flags (which may be in any order).

var RE_WHITESPACE = reWhitespace({
    'flags': 'gm'
});

var str = 'Hello World!';
var bool = RE_WHITESPACE.test( str );
// returns true

bool = RE_WHITESPACE.test( str );
// returns false

By default, the function returns a regular expression which does not capture the part of a string matching the regular expression. To capture matches, set the capture option.

var RE_WHITESPACE = reWhitespace({
    'capture': true
});
var str = 'Hello World!';
var arr = str.split( RE_WHITESPACE );
// returns [ 'Hello', ' ', 'World!' ]

reWhitespace.REGEXP

Regular expression to match a white space character.

var bool = reWhitespace.REGEXP.test( '\n' );
// returns true

bool = reWhitespace.REGEXP.test( '\\n' );
// returns false

reWhitespace.REGEXP_CAPTURE

Regular expression to capture characters matching a white space character.

var replace = require( '@stdlib/string-replace' );

var str = 'Duplicate capture';
var out = replace( str, reWhitespace.REGEXP_CAPTURE, '$1$1' );
// returns 'Duplicate  capture'

Notes

• Matches the 25 characters defined as white space ("WSpace=Y","WS") characters in the Unicode 9.0 character database.

• Matches one related white space character without the Unicode character property "WSpace=Y" (zero width non-breaking space which was deprecated as of Unicode 3.2).

• The REGEXP regular expression is defined as

  /[\u0009\u000A\u000B\u000C\u000D\u0020\u0085\u00A0\u1680\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u2028\u2029\u202F\u205F\u3000\uFEFF]/

• The REGEXP_CAPTURE regular expression is defined as

  /([\u0009\u000A\u000B\u000C\u000D\u0020\u0085\u00A0\u1680\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u2028\u2029\u202F\u205F\u3000\uFEFF])/

Examples

var reWhitespace = require( '@stdlib/regexp-whitespace' );

var RE_WHITESPACE = reWhitespace();

var bool = RE_WHITESPACE.test( 'beep boop' );
// returns true

bool = RE_WHITESPACE.test( '\n' );
// returns true

bool = RE_WHITESPACE.test( '\r' );
// returns true

bool = RE_WHITESPACE.test( '\t' );
// returns true

bool = RE_WHITESPACE.test( 'beep' );
// returns false

var str = 'This is\na newline\r\ndelimited string.';

var arr = str.split( RE_WHITESPACE );
// returns [ 'This', 'is', 'a', 'newline', '', 'delimited', 'string.' ]

See Also

• @stdlib/assert-is-whitespace: test whether a string contains only white space characters.

Notice

This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.

Community

License

See LICENSE.

Copyright

Copyright © 2016-2024. The Stdlib Authors.