Lookbehind in JS regular expressions
The positive lookbehind (`(?<= )`) and negative lookbehind (`(?<! )`) zero-width assertions in JavaScript regular expressions can be used to ensure a pattern is preceded by another pattern.
urlpattern api: hasregexpgroups
css at-rule: `@document`: `regexp()`
javascript built-in: regexp
javascript built-in: regexp: @@match
javascript built-in: regexp: @@matchall
javascript built-in: regexp: @@replace
javascript built-in: regexp: @@search
javascript built-in: regexp: @@species
javascript built-in: regexp: @@split
javascript built-in: regexp: compile
javascript built-in: regexp: dotall
javascript built-in: regexp: exec
javascript built-in: regexp: flags
javascript built-in: regexp: global
javascript built-in: regexp: global: prototype accessor property (es2015)
javascript built-in: regexp: hasindices
javascript built-in: regexp: ignorecase
javascript built-in: regexp: ignorecase: prototype accessor property (es2015)
javascript built-in: regexp: `regexp.input` (`$_`)
javascript built-in: regexp: lastindex
javascript built-in: regexp: `regexp.lastmatch` (`$&`)
javascript built-in: regexp: `regexp.lastparen` (`$+`)
javascript built-in: regexp: `regexp.leftcontext` (`$``)
javascript built-in: regexp: multiline
javascript built-in: regexp: multiline: prototype accessor property (es2015)
javascript built-in: regexp: `regexp.$1-$9`
javascript built-in: regexp: `regexp()` constructor
javascript built-in: regexp: `regexp.rightcontext` (`$'`)
javascript built-in: regexp: source
javascript built-in: regexp: source: "(?:)" for empty regexps
javascript built-in: regexp: source: escaping
javascript built-in: regexp: source: prototype accessor property (es2015)
javascript built-in: regexp: sticky
javascript built-in: regexp: sticky: anchored sticky flag behavior per es2015
javascript built-in: regexp: sticky: prototype accessor property (es2015)
javascript built-in: regexp: test
javascript built-in: regexp: tostring
javascript built-in: regexp: tostring: escaping
javascript built-in: regexp: unicode
javascript built-in: regexp: unicodesets
lookahead assertions in js regular expressions
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