rauschma / re-template-tag

re-template-tag: easily compose regular expressions

This package provides the template tag re for composing regular expressions.

Basic syntax

Syntax: the following two expressions produce the same regular expression.

re`/abc/gu`
/abc/gu

Composing regular expressions

import {re} from 're-template-tag';

const RE_YEAR = /([0-9]{4})/;
const RE_MONTH = /([0-9]{2})/;
const RE_DAY = /([0-9]{2})/;
const RE_DATE = re`/^${RE_YEAR}-${RE_MONTH}-${RE_DAY}$/u`;

RE_DATE.test('2017-01-23'); // true

More information

• Take a look at the unit tests.
• Check out the blog post on re-template-tag.

Related work

• http://xregexp.com
• https://github.com/DmitrySoshnikov/regexp-tree
• https://github.com/shannonmoeller/regx

Acknowledgement

The syntax for separating flags from the actual regular expression is based on an idea by Mathias Bynens.