RegExp Build

Build and join RegExp for JavaScript and TypeScript.

Installation

npm install regexp-build

Using

import { find, optional } from 'regexp-build';

// /[-+]?\d/
const regex = find([optional([/[-+]/]), /\d/]);

Functions

| Function | Regex | Description | |-------------------------|----------------|------------------------------------| | regex(...) | /.../ | Join many RegExp to one | | find(...) | /.../ | Create RegExp for find | | pattern(...) | /^...$/ | Create RegExp for match string | | group(...) | /(...) / | Create RegExp group | | group(..., name) | /(?...)/ | Create RegExp group with name | | zeroOrMore(...) | /(...)*/ | Create zero or more repeat RegExp | | oneOrMore(...) | /(...)+/ | Create one or more repeat RegExp | | optional(...) | /(...)?/ | Create optional RegExp | | repeat(..., count) | /(...){count}/ | Create n repeat RegExp | | choiceOf(..., ...) | /(...|...)/ | Create RegExp for select one | | lookahead(...) | /(?=...)/ | Create look a head RegExp | | negativeLookhead(...) | /(!=...)/ | Create negative look a head RegExp | | lookbehind(...) | /(?<=...)/ | Create look behind RegExp | | negativeLookbehind(...) | /(?<!...)/ | Create negative look behind RegExp |

Example

import { choiceOf, pattern, zeroOrMore } from 'regexp-build';

const domain = /\w+\.[a-z]{3}/;
// /http|https/
const protocol = choiceOf([/http/], [/https/]);
// /^(?:http|https):\/\/(?:\w+\.)*\w+\.[a-z]{3}$/
const url = pattern([protocol, /:\/\//, zeroOrMore(/\w+\./), domain]);
// /^\w+@\w+\.[a-z]{3}$/
const email = pattern([/\w+@/, domain]);