Regular Expression Utility
Usage
CommonJS
const {toPattern} = require('@taufik-nurrohman/pattern');
console.log(toPattern('[a-z]+'));ECMAScript
import {toPattern} from '@taufik-nurrohman/pattern';
console.log(toPattern('[a-z]+'));Methods
esc(pattern, extra = "")
Escape regular expression characters in string except \.
escChar(pattern, extra = "")
Escape regular expression characters for character class only. E.g. ^, [, ], and -.
extractInner(content, start, end, opt = "")
Extract nesting constructs in a string.
console.log(extractInner('a(b(c))d(e)f((g)h)', '\\(', '\\)'));[
['b(c)', [
['c', [], 2, 3]
], 2, 6],
['e', [], 9, 10],
['(g)h', [
['g', [], 1, 2]
], 13, 17]
]extractTokens(content, tokens, defaultTokenName = 0)
console.log(extractTokens('This is an <a href="https://example.com">active link</a> and an <a>empty link</a>.', [
['(<)([\\w:-]+)(\\s[^>]*?)?(>)', ['tag', 'p', 'name', [
['"[^"]+"', 'value'],
['=', 'p'],
['[\\w:-]+', 'key']
], 'p']],
['(<)(/)([\\w:-]+)(>)', ['tag', 'p', 'p', 'name', 'p']]
]));[
[['This is an '], [0]],
[['<a href="https://example.com">', '<', 'a', ' href="https://example.com"', '>'], ['tag', 'p', 'name', [
[[' '], [0]],
[['href'], ['key']],
[['='], ["p"]],
[['"https://example.com"'], ['value']]
], 'p']],
[['active link'], [0]],
[['</a>', '<', '/', 'a', '>'], ['tag', 'p', 'p', 'name', 'p']],
[[' and an '], [0]],
[['<a>', '<', 'a', undefined, '>'], ['tag', 'p', 'name', 0, 'p']],
[['empty link'], [0]],
[['</a>', '<', '/', 'a', '>'], ['tag', 'p', 'p', 'name', 'p']],
[['.'], [0]]
]fromPattern(pattern)
Get pattern from RegExp as string.
isPattern(x)
Detect if x is an instance of RegExp.
token(start, content|contents, end = start, skip)
Build pattern string from parameters.
console.log(token('"'));tokenGroup(start, content|contents, end = start, skip)
Build pattern string from parameters as a group of start, content and end.
console.log(tokenGroup('"'));toPattern(string, opt = 'g')
Convert pattern string to RegExp instance.
x
List of regular expression’s special characters except \.
