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.
csscounterstylerule api: negative
htmltablerowelement api: insertcell: `index` parameter can be `-1`
css at-rule: `@counter-style`: negative
css property: z-index: negative values
javascript built-in: intl: numberformat: `numberformat()` constructor: `options` parameter: `options.signdisplay` parameter: `negative` value
javascript built-in: number: negative_infinity
lookahead assertions in js regular expressions
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