@stdlib/string-substring-before-last NPM

substringBeforeLast

Return the part of a string before the last occurrence of a specified substring.

Installation

npm install @stdlib/string-substring-before-last

Usage

var substringBeforeLast = require( '@stdlib/string-substring-before-last' );

substringBeforeLast( str, search )

Returns the part of a string before the last occurrence of a specified substring.

var str = 'Beep Boop Beep';
var out = substringBeforeLast( str, 'Beep' );
// returns 'Beep Boop '

out = substringBeforeLast( str, 'Boop' );
// returns 'Beep '

Notes

If a substring is not present in a provided string, the function returns the input string.
If provided an empty substring, the function returns the input string.

Examples

var substringBeforeLast = require( '@stdlib/string-substring-before-last' );

var str = 'beep boop';
var out = substringBeforeLast( str, ' ' );
// returns 'beep'

out = substringBeforeLast( str, 'e' );
// returns 'be'

out = substringBeforeLast( str, 'x' );
// returns 'beep boop'

out = substringBeforeLast( str, '' );
// returns 'beep boop'

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.