ECMAScript Regular Expression Parser

`regexpp` is a specialized library for parsing and validating ECMAScript regular expressions, generating an Abstract Syntax Tree (AST) that precisely conforms to the ECMAScript specification. It provides robust tools for static analysis of regex patterns, including a parser (`RegExpParser`), a validator (`RegExpValidator`), and a visitor pattern (`RegExpVisitor`) for AST traversal. The current stable version, 3.2.0, actively receives updates to support the latest ECMAScript features and Unicode versions. This package differentiates itself by offering fine-grained control over the parsing process, allowing specification of ECMAScript version targets and Unicode flags, making it invaluable for linters, code transformers, and tools that require a deep, standards-compliant understanding and manipulation of regular expressions. Its release cadence is active, with significant updates roughly yearly for major versions and minor releases as needed to keep pace with spec changes and bug fixes.