Registry / serialization / regexp-tree-cli

regexp-tree-cli

library0.0.21jsnpmunverified

Command-line interface for the regexp-tree library (v0.0.21). Parses, optimizes, and transpiles JavaScript/ECMAScript regular expressions, producing ASTs with loc support, NFA/DFA transition tables, and compatibility transpilation. Unlike regex libraries that only match or replace, regexp-tree-cli operates at the AST level for transformations and analysis. Primarily a CLI tool, but can be used programmatically via the regexp-tree package. Last stable release is v0.0.21; development is infrequent but the underlying regexp-tree library is more actively maintained.

serialization

npm install regexp-tree-cli

github ↗package ↗

INSTALL

IMPORT

SIG · REGEXP-TREE-CLI

regexp-tree-cli

serializationjavascriptv0.0.21

harness data pending

Install & Compatibility

Where this runs

No compatibility data collected yet for this library.

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

parse

✓ import { parse } from 'regexp-tree'

✗ const parse = require('regexp-tree').parse

regexp-tree is the programmatic backend; this CLI is a thin wrapper. ESM import is standard.

generate

✓ import { generate } from 'regexp-tree'

✗ import { generate } from 'regexp-tree-cli'

generate converts AST back to regex string; available only from regexp-tree

optimize

✓ import { optimize } from 'regexp-tree'

✗ import optimize from 'regexp-tree'

optimize is a named export, not default

Install CLI globally, parse a regex with location and optimizer output.

npm install -g regexp-tree-cli regexp-tree-cli -e '/a|b/i' -o -l

regexp-tree-cli --version

Debug

Known issues

gotchaThe expression must be wrapped in slashes and quotes, e.g., -e '/[a-z]/i'. Omitting slashes will cause parse failure.

fix

Always include slashes: regexp-tree-cli -e '/pattern/flags'

affects: >=0.0.1

deprecatedThe --compat option for compat-transpiler may not cover all modern regex features (e.g., lookbehind).

fix

Use regexp-tree's compat-transpiler directly for full support.

affects: <=0.0.21

gotchaCLI output is JSON, but with no newline at end; piping may break scripts expecting trailing newline.

fix

Use `--table` output to get formatted tables for NFA/DFA.

affects: <=0.0.21

Errors

Common errors & fixes

ReferenceError: regexp-tree-cli is not defined

Trying to import the CLI package directly in Node.js code instead of using the command line.

fix

Use the CLI from the terminal, or import 'regexp-tree' for programmatic use.

Error: Invalid regular expression: / /: Nothing to repeat

Passing an expression without slashes or with an empty regex.

fix

Wrap in slashes: -e '/ /' or provide a valid pattern.

SyntaxError: Unexpected token 'u' in JSON at position 0

Using --compat or --optimize on an unsupported regex, producing non-JSON output.

fix

Ensure the regex is valid and pattern is enclosed in slashes.

Upgrade

Version history

0.0.21latest on npm

Audit

Dependencies

regexp-treerequiredCore regex parsing and transformation engine

Agent activity

4 hits · last 30 days

node

Resources

githubhttps://github.com/DmitrySoshnikov/regexp-tree-cli ↗

packagehttps://www.npmjs.com/package/regexp-tree-cli ↗