e1da4930_tionals_in_Regular_Expressions__Supports_real_conditionals
[Language] JavaScript [Supports "fake conditionals"] No [Notes] JavaScript assigns an empty string, rather than null, to backreferences for non-participating capturing groups. Unfortunately, this pattern depends on the way most other libraries handle non-participating capturing groups. [Supports real conditionals] 
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Flagrant Badassery: Faking Conditionals in Regular Expressions
Supports real conditionals