Method: Regexp#arity

Defined in:
lib/core/facets/regexp/arity.rb

#arity ⇒ Object

Returns the number of backreferencing subexpressions.

/(a)(b)(c)/.arity  #=> 3
/(a(b(c)))/.arity  #=> 3

Note that this is not perfect, especially with regards to x and embedded comments.

CREDIT: Trans



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# File 'lib/core/facets/regexp/arity.rb', line 13

def arity
  source.scan( /(?!\\)[(](?!\?[#=:!>-imx])/ ).length
end