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regex-tools/docs/FLAVOUR_SUPPORT.md

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Flavour support

Flavour Syntax Execution Replacement Captures Trace Native offsets
ECMAScript regexpp 4.12.2 grammar; explanations partial/feature-matrix tested Current browser RegExp; feature-matrix tested Native matches; bounded ECMAScript GetSubstitution Named/numbered; final repeated capture; no history Unavailable UTF-16
PCRE2 Unavailable in release Technical spike only; not shipped Unavailable Unavailable Unavailable Planned UTF-8 bytes
PCRE Unavailable Unavailable Unavailable Unavailable Unavailable Unavailable
Python re Unavailable Unavailable Unavailable Unavailable Unavailable Planned code points
Go regexp Unavailable Unavailable Unavailable Unavailable Unavailable Planned UTF-8 bytes
Rust regex Unavailable Unavailable Unavailable Unavailable Unavailable Planned UTF-8 bytes
.NET Unavailable Unavailable Unavailable Planned capture history Unavailable Planned UTF-16
Java Unavailable Unavailable Unavailable Unavailable Unavailable Planned UTF-16

ECMAScript tests cover g, y, u, internal d, zero-length iteration, named groups, unmatched/empty/repeated groups, lookbehind, backreferences, Unicode properties, astral input, replacement and result truncation.

Actual browser identity is displayed because ECMAScript behavior can evolve with the runtime. Syntax acceptance and engine compilation are separate; neither silently rewrites the pattern.