regex-not
Advanced tools
Package description
The regex-not npm package is designed to create regular expressions for matching everything except a specified pattern. This can be particularly useful when you need to exclude certain patterns from your matches.
Basic Negation
This feature allows you to create a regular expression that matches any string except the specified pattern. In this example, the pattern 'foo' is excluded from the matches.
const not = require('regex-not');
const re = not('foo');
console.log(re); // => /^(?:(?!^(?:foo)$).)+$/Negation with Flags
This feature allows you to add flags to the negated regular expression. In this example, the global flag 'g' is added to the pattern that excludes 'foo'.
const not = require('regex-not');
const re = not('foo', { flags: 'g' });
console.log(re); // => /^(?:(?!^(?:foo)$).)+$/gNegation with Custom Delimiters
This feature allows you to specify custom delimiters for the negated pattern. In this example, the delimiters '<' and '>' are used around the pattern 'foo'.
const not = require('regex-not');
const re = not('foo', { delimiters: ['<', '>'] });
console.log(re); // => /^(?:(?!<foo>).)+$/The 'negate' package provides similar functionality by allowing you to create a negated version of a given regular expression. It is simpler and more focused on negation without additional customization options like flags or delimiters.
The 'regex-invert' package inverts a given regular expression, effectively creating a pattern that matches everything except the original pattern. It is similar to regex-not but may have different performance characteristics and fewer customization options.
The 'invert-regex' package is another alternative that inverts a given regular expression. It is straightforward and easy to use, but it may not offer the same level of customization as regex-not.
Readme
Create a javascript regular expression for matching everything except for the given string.
Please consider following this project's author, Jon Schlinkert, and consider starring the project to show your :heart: and support.
Install with npm:
$ npm install --save regex-not
var not = require('regex-not');
The main export is a function that takes a string an options object.
not(string[, options]);
Example
var not = require('regex-not');
console.log(not('foo'));
//=> /^(?:(?!^(?:foo)$).)+$/
Strict matching
By default, the returned regex is for strictly (not) matching the exact given pattern (in other words, "match this string if it does NOT exactly equal foo"):
var re = not('foo');
console.log(re.test('foo')); //=> false
console.log(re.test('bar')); //=> true
console.log(re.test('foobar')); //=> true
console.log(re.test('barfoo')); //=> true
Returns a string to allow you to create your own regex:
console.log(not.create('foo'));
//=> '(?:(?!^(?:foo)$).)+'
options.contains
You can relax strict matching by setting options.contains to true (in other words, "match this string if it does NOT contain foo"):
var re = not('foo');
console.log(re.test('foo', {contains: true})); //=> false
console.log(re.test('bar', {contains: true})); //=> true
console.log(re.test('foobar', {contains: true})); //=> false
console.log(re.test('barfoo', {contains: true})); //=> false
Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.
Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:
$ npm install && npm test
(This project's readme.md is generated by verb, please don't edit the readme directly. Any changes to the readme must be made in the .verb.md readme template.)
To generate the readme, run the following command:
$ npm install -g verbose/verb#dev verb-generate-readme && verb
You might also be interested in these projects:
| Commits | Contributor |
|---|---|
| 9 | jonschlinkert |
| 1 | doowb |
| 1 | EdwardBetts |
Jon Schlinkert
Copyright © 2018, Jon Schlinkert. Released under the MIT License.
This file was generated by verb-generate-readme, v0.6.0, on February 19, 2018.
FAQs
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The npm package regex-not receives a total of 8,295,882 weekly downloads. As such, regex-not popularity was classified as popular.
We found that regex-not demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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