class Regexp

Public Instance Methods

arity() click to toggle source

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

# File lib/core/facets/regexp/arity.rb, line 13
def arity
  source.scan( /(?!\)[(](?!\?[#=:!>-imx])/ ).length
end
to_re(esc=false) click to toggle source

Simply returns itself. Helpful when converting strings to regular expressions, where regexp might occur as well –in the same vien as using to_s on symbols. The parameter is actaully a dummy parameter to coincide with String#to_re.

/abc/.to_re  #=> /abc/

CREDIT: Trans

# File lib/core/facets/regexp/to_re.rb, line 24
def to_re(esc=false)
  self  # Of course, things really should know how to say "I" ;)
end
to_regexp() click to toggle source

Like to_re, but following Ruby's formal definitions, only a Regular expression type object will respond to this.

Note that to be of much real use this should be defined in core Ruby.

CREDIT: Florian Gross

# File lib/core/facets/regexp/to_re.rb, line 10
def to_regexp
  self
end