PHP's preg_replace in TypeScript

How to use

Install via yarn add locutus and import: import { preg_replace } from 'locutus/php/pcre/preg_replace'.

Or with CommonJS: const { preg_replace } = require('locutus/php/pcre/preg_replace')

Use a bundler that supports tree-shaking so you only ship the functions you actually use. Vite, webpack, Rollup, and Parcel all handle this. For server-side use this is less of a concern.

Examples

These examples are extracted from test cases that automatically verify our functions against their native counterparts.

#	code	expected result
1	preg_replace('/xmas/i', 'Christmas', 'It was the night before Xmas.')	"It was the night before Christmas."
2	preg_replace('/xmas/ig', 'Christmas', 'xMas: It was the night before Xmas.')	"Christmas: It was the night before Christmas."
3	preg_replace('\/(\\w+) (\\d+), (\\d+)\/i', '$11,$3', 'April 15, 2003')	"April1,2003"
4	preg_replace('/[^a-zA-Z0-9]+/', '', 'The Development of code . http://www.')	"TheDevelopmentofcodehttpwww"
5	preg_replace('/[^A-Za-z0-9_\\s]/', '', 'D"usseldorfer H"auptstrasse')	"Dusseldorfer Hauptstrasse"

Here's what our current TypeScript equivalent to PHP's preg_replace looks like.

TSTypeScript JSJavaScript TSStandalone TS JSStandalone JS

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export function preg_replace(pattern: string, replacement: string, string: string): string {
  // original by: rony2k6 (https://github.com/rony2k6)
  //   example 1: preg_replace('/xmas/i', 'Christmas', 'It was the night before Xmas.')
  //   returns 1: "It was the night before Christmas."
  //   example 2: preg_replace('/xmas/ig', 'Christmas', 'xMas: It was the night before Xmas.')
  //   returns 2: "Christmas: It was the night before Christmas."
  //   example 3: preg_replace('\/(\\w+) (\\d+), (\\d+)\/i', '$11,$3', 'April 15, 2003')
  //   returns 3: "April1,2003"
  //   example 4: preg_replace('/[^a-zA-Z0-9]+/', '', 'The Development of code . http://www.')
  //   returns 4: "TheDevelopmentofcodehttpwww"
  //   example 5: preg_replace('/[^A-Za-z0-9_\\s]/', '', 'D"usseldorfer H"auptstrasse')
  //   returns 5: "Dusseldorfer Hauptstrasse"
  const delimiter = pattern.charAt(0)
  const lastDelimiterIndex = pattern.lastIndexOf(delimiter)
  let _flag = pattern.substr(lastDelimiterIndex + 1)
  _flag = _flag !== '' ? _flag : 'g'
  const _pattern = pattern.substr(1, lastDelimiterIndex - 1)
  const regex = new RegExp(_pattern, _flag)
  const result = string.replace(regex, replacement)

  return result
}

export function preg_replace(pattern, replacement, string) {
  // original by: rony2k6 (https://github.com/rony2k6)
  //   example 1: preg_replace('/xmas/i', 'Christmas', 'It was the night before Xmas.')
  //   returns 1: "It was the night before Christmas."
  //   example 2: preg_replace('/xmas/ig', 'Christmas', 'xMas: It was the night before Xmas.')
  //   returns 2: "Christmas: It was the night before Christmas."
  //   example 3: preg_replace('\/(\\w+) (\\d+), (\\d+)\/i', '$11,$3', 'April 15, 2003')
  //   returns 3: "April1,2003"
  //   example 4: preg_replace('/[^a-zA-Z0-9]+/', '', 'The Development of code . http://www.')
  //   returns 4: "TheDevelopmentofcodehttpwww"
  //   example 5: preg_replace('/[^A-Za-z0-9_\\s]/', '', 'D"usseldorfer H"auptstrasse')
  //   returns 5: "Dusseldorfer Hauptstrasse"
  const delimiter = pattern.charAt(0)
  const lastDelimiterIndex = pattern.lastIndexOf(delimiter)
  let _flag = pattern.substr(lastDelimiterIndex + 1)
  _flag = _flag !== '' ? _flag : 'g'
  const _pattern = pattern.substr(1, lastDelimiterIndex - 1)
  const regex = new RegExp(_pattern, _flag)
  const result = string.replace(regex, replacement)

  return result
}

Improve this function

Locutus is a community effort following The McDonald's Theory: we ship first iterations, hoping others will improve them. If you see something that could be better, we'd love your contribution.

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