npmpackage.info

Gathering detailed insights and metrics for regexp-to-ast

Other packages similar to regexp-to-ast

@chevrotain/regexp-to-ast

11.0.3

Parses a Regular Expression and outputs an AST

@regexper/parser

1.0.0

Parse regular expression to ast tree

apg-exp

2.1.1

(Deprecated: use apg-js instead.) Pattern-matching alternative to RegExp. Replaces the regular expression syntax with ABNF. Adds APG parser features such as User Defined Terminals (hand-written pattern matchers) and access to the AST.

@teamteanpm2024/quasi-occaecati-architecto

1.1.5

*A mostly reasonable approach to JavaScript*

Gathering detailed insights and metrics for regexp-to-ast

regexp-to-ast - 0.5.0 | npmpackage.info

regexp-to-ast

0.5.0

MIT

JavaScript

2.1

Installations

npm install regexp-to-ast

Developer Guide

BETA

Typescript

No

Module System

CommonJS

Node Version

12.13.1

NPM Version

6.12.1 Pull Requests

Open

22

Total

115

Closed

80

Merged

13

Issues

Open

6

Total

16

Closed

10

Releases

Unable to fetch releases

Languages

JavaScript

JavaScript (100%)

Developer

bd82

Download Statistics

Total Downloads

Last Day

Last Week

Last Month

Last Year

GitHub Statistics

MIT License

28 Stars

74 Commits

11 Forks

1 Watchers

25 Branches

4 Contributors

Updated on Jan 28, 2025

Maintainers

View All 4 Contributors

Package Meta Information

Latest Version

0.5.0

Package Id

regexp-to-ast@0.5.0

Size

8.82 kB

NPM Version

6.12.1

Node Version

12.13.1

Published on

Dec 11, 2019

Total Downloads

Cumulative downloads

Total Downloads

NaN

Last Day

NaN

Compared to previous day

Last Week

NaN

Compared to previous week

Last Month

NaN

Compared to previous month

Last Year

NaN

Compared to previous year

Weekly Downloads

Monthly Downloads

Yearly Downloads

Dev Dependencies

chai coveralls eslint eslint-config-airbnb-base eslint-config-prettier eslint-plugin-es5 gitty jsonfile lodash mocha npm-run-all nyc prettier semver typescript

regexp-to-ast

Reads a JavaScript Regular Expression literal(text) and outputs an Abstract Syntax Tree.

Installation

npm
```
  npm install regexp-to-ast
```

Browser

  <script src="https://unpkg.com/regexp-to-ast/lib/parser.js"></script>

API

The API is defined as a TypeScript definition file.

Usage

Parsing to an AST:

1const RegExpParser = require("regexp-to-ast").RegExpParser
2const regexpParser = new RegExpParser.parser()
3
4// from a regexp text
5const astOutput = regexpParser.pattern("/a|b|c/g")
6
7// text from regexp instance.
8const input2 = /a|b/.toString()
9// The same parser instance can be reused
10const anotherAstOutput = regexpParser.pattern(input2)

Visiting the AST:

1// parse to an AST as before.
2const { RegExpParser, BaseRegExpVisitor } = require("regexp-to-ast")
3const regexpParser = new RegExpParser.parser()
4const regExpAst = regexpParser.pattern("/a|b|c/g")
5
6// Override the visitor methods to add your logic.
7class MyRegExpVisitor extends BaseRegExpVisitor {
8    visitPattern(node) {}
9
10    visitFlags(node) {}
11
12    visitDisjunction(node) {}
13
14    visitAlternative(node) {}
15
16    // Assertion
17    visitStartAnchor(node) {}
18
19    visitEndAnchor(node) {}
20
21    visitWordBoundary(node) {}
22
23    visitNonWordBoundary(node) {}
24
25    visitLookahead(node) {}
26
27    visitNegativeLookahead(node) {}
28
29    // atoms
30    visitCharacter(node) {}
31
32    visitSet(node) {}
33
34    visitGroup(node) {}
35
36    visitGroupBackReference(node) {}
37
38    visitQuantifier(node) {}
39}
40
41const myVisitor = new MyRegExpVisitor()
42myVisitor.visit(regExpAst)
43// extract visit results from the visitor state.

Compatibility

This library is written in ES5 style and is compatiable with all major browsers and modern node.js versions.

TODO / Limitations

Use polyFill for string.prototype.at to support unicode characters outside BMP.
Descriptive error messages.
Position information in error messages.
Support unicode flag escapes.
Ensure edge cases described in "The madness of parsing real world JavaScript regexps" are supported.
Support deprecated octal escapes

No vulnerabilities found.

10

Binary-Artifacts

Determines if the project has generated executable (binary) artifacts in the source repository.

10

License

Determines if the project has defined a license.

1

Code-Review

Determines if the project requires human code review before pull requests (aka merge requests) are merged.

0

Maintained

Determines if the project is "actively maintained".

0

CII-Best-Practices

Determines if the project has an OpenSSF (formerly CII) Best Practices Badge.

0

Security-Policy

Determines if the project has published a security policy.

0

Fuzzing

Determines if the project uses fuzzing.

0

SAST

Determines if the project uses static code analysis.

0

Vulnerabilities

Determines if the project has open, known unfixed vulnerabilities.

Score

2.1

/10

Last Scanned on 2025-07-07

The Open Source Security Foundation is a cross-industry collaboration to improve the security of open source software (OSS). The Scorecard provides security health metrics for open source projects.

Learn More