As of Firefox 78, we will ship an updated version of the regexp engine, which
will support dotAll, unicode property escapes, and lookbehind assertions.
Use case:
The dotAll flag allows `.` in regular expressions to match any character,
including newlines.
Unicode property escapes can be used to match characters according to certain
Unicode properties. For example,
`/^\p{Decimal_Number}+$/u.test('𝟏𝟐𝟑𝟜𝟝𝟞𝟩𝟪𝟫𝟬𝟭𝟮𝟯𝟺𝟻𝟼') === true`.
Lookbehind assertions can be used to make sure that a pattern is or is not
preceded by another (just as lookahead assertions can be used to make that a
pattern is or is not succeeded by another).
All three of these features were added to the standard in ES2018. They are
becoming a webcompat issue. It is important to get them landed in time for
ESR78.
Bug:
Meta bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1367105
Bug to enable by default: https://bugzilla.mozilla.org/show_bug.cgi?id=1634135
Standard:
https://github.com/tc39/proposal-regexp-dotall-flag
https://github.com/tc39/proposal-regexp-unicode-property-escapes
https://github.com/tc39/proposal-regexp-lookbehind
Platform coverage:
All, no pref
DevTools bug:
N/A
Other browsers:
dotAll:
V8 shipping in 62 <https://bugs.chromium.org/p/v8/issues/detail?id=6172>
JSC shipping in Safari Technology Preview 39a
<https://bugs.webkit.org/show_bug.cgi?id=172634>
Unicode property escapes:
V8 shipping in 64 <https://bugs.chromium.org/p/v8/issues/detail?id=4743>
JSC shipping in Safari Technology Preview 42
<https://developer.apple.com/safari/technology-preview/release-notes/>
Lookbehind assertions:
V8 shipping in 62 <https://bugs.chromium.org/p/v8/issues/detail?id=4545>
JSC tracking issue: https://bugs.webkit.org/show_bug.cgi?id=174931
Testing:
There are test262 tests covering these features:
https://github.com/tc39/test262/tree/master/test/built-ins/RegExp/lookBehind
https://github.com/tc39/test262/tree/master/test/built-ins/RegExp/dotall
https://github.com/tc39/test262/tree/master/test/built-ins/RegExp/property-escapes
Secure contexts:
This is a JS language feature and is therefore present in all contexts.
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