An expression tokenizer, parser and evaluator.

RE2JS is the JavaScript port of RE2, a regular expression engine that provides linear time matching

ObjectStack canonical expression engine — CEL (cel-js) + ObjectStack stdlib + dialect registry

JavaScript Extended regular expression engine - client side, server side and 'angular side' ready.

An embeddable expression engine for natural-language calculations: units, currencies, percentages, dates and matrices, with the parsing and evaluation plumbing already built.

Pactor expression: controlled AST expression engine (no eval, no global access)

OCL (Object Constraint Language) expression engine for TypeScript — lexer, parser, evaluator, and validator

OCL (Object Constraint Language) expression engine for TypeScript — lexer, parser, evaluator, and validator

Conovo field taxonomy, expression engine, resolver, and validator — pure and deterministic

SilverDecisions expression engine module

A fully streaming regular expression engine

A headless condition expression engine for filters and rule builders

Framework-agnostic ZEN expression engine: compile, evaluate, and type-analyze expressions over the GoRules ZEN WASM engine.

Cachebuster for Expression Engine

Expression engine for evaluating CloudPSS formulas and scripts.

Makeen Expression Engine

Parser, schema validation, expression engine and static checks for BFFless Workflow YAML (spec: apps/workflow/docs/spec/)

a simple boolean expression engine using reparse

Agnostic expression engine: parse, unparse, evaluate, and serialise a small condition/effect expression language. Scopes and built-in functions are injected via a Dialect.

High-performance, secure frontend expression engine compatible