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Replace search occurrences with a replacement string.

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stdlib-js/string-replace

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replace

NPM version Build Status Coverage Status

Replace search occurrences with a replacement string.

Installation

npm install @stdlib/string-replace

Alternatively,

  • To load the package in a website via a script tag without installation and bundlers, use the ES Module available on the esm branch (see README).
  • If you are using Deno, visit the deno branch (see README for usage intructions).
  • For use in Observable, or in browser/node environments, use the Universal Module Definition (UMD) build available on the umd branch (see README).
  • To use as a general utility for the command line, install the corresponding CLI package globally.

The branches.md file summarizes the available branches and displays a diagram illustrating their relationships.

To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.

Usage

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

replace( str, search, newval )

Replaces search occurrences with a replacement string.

var out = replace( 'beep', 'e', 'o' );
// returns 'boop'

If provided a function as the third argument, the function is invoked for each match, and the function's return value is used as the replacement string.

function replacer( match, p1 ) {
    return '/' + p1 + '/';
}
var str = 'Oranges and lemons';
var out = replace( str, /([^\s]+)/gi, replacer );
// returns '/Oranges/ /and/ /lemons/'

Notes

  • The function has one notable difference from String.prototype.replace. When provided a string as the search value, the function replaces all occurrences. To remove only the first match, use a regular expression.

    var out = replace( 'beep', /e/, 'o' );
    // returns 'boep'

Examples

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

var out = replace( 'beep', 'e', 'o' );
// returns 'boop'

out = replace( 'Hello World', /world/i, 'Mr. President' );
// returns 'Hello Mr. President'

function replacer( match, p1 ) {
    return capitalize( p1 );
}
var str = 'Oranges and lemons say the bells of St. Clement\'s';
out = replace( str, /([^\s]*)/gi, replacer );
// returns 'Oranges And Lemons Say The Bells Of St. Clement\'s'

CLI

Installation

To use as a general utility, install the CLI package globally

npm install -g @stdlib/string-replace-cli

Usage

Usage: replace [options] [<string>] --search=<string> --newval=<string>

Options:

  -h,    --help                Print this message.
  -V,    --version             Print the package version.
         --search string       Search string.
         --newval string       Replacement string.
         --split sep           Delimiter for stdin data. Default: '/\\r?\\n/'.

Notes

  • If the split separator is a regular expression, ensure that the split option is either properly escaped or enclosed in quotes.

    # Not escaped...
    $ echo -n $'foo\nbar' | replace --search='o' --newval='e' --split /\r?\n/
    
    # Escaped...
    $ echo -n $'foo\nbar' | replace --search='o' --newval='e' --split /\\r?\\n/
  • The implementation ignores trailing delimiters.

Examples

$ replace --search='/[eo]/' --newval=a beep
baap

To use as a standard stream,

$ echo -n 'boop' | replace --search='o' --newval='e'
beep

By default, when used as a standard stream, the implementation assumes newline-delimited data. To specify an alternative delimiter, set the split option.

$ echo -n 'boop\tfoo' | replace --search='o' --newval='e' --split '\t'
beep
fee

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.

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License

See LICENSE.

Copyright

Copyright © 2016-2024. The Stdlib Authors.