Sha256: 52a606acb9a6b4c864e4872a4754528ff99fbf40d3ab21f2d3f6a4c7fb9153c1
Contents?: true
Size: 975 Bytes
Versions: 10
Compression:
Stored size: 975 Bytes
Contents
# TITLE:
# Regexp Arity
#
# DESCRIPTION:
# Matchdata methods to produces a hierachical list of a match result.
# This also includes Regexp#arity.
#
# AUTHORS:
# - Thomas Sawyer
#
class Regexp
# Returns the number of backreferencing subexpressions.
#
# /(a)(b)(c)/.arity #=> 3
# /(a(b(c)))/.arity #=> 3
#
# Note: This is not perfect, especially with regards to \x
# and embedded comments.
def arity
self.source.scan( /(?!\\)[(](?!\?[#=:!>-imx])/ ).length
end
end
# _____ _
# |_ _|__ ___| |_
# | |/ _ \/ __| __|
# | | __/\__ \ |_
# |_|\___||___/\__|
#
=begin test
require 'test/unit'
class TestRegexpArity < Test::Unit::TestCase
def test_arity
r = /(1)(2)(3)/
assert_equal( 3, r.arity )
r = /(1)(2)(3)(4)/
assert_equal( 4, r.arity )
r = /(1)(2)((a)3)/
assert_equal( 4, r.arity )
r = /(?#nothing)(1)(2)(3)(?=3)/
assert_equal( 3, r.arity )
end
end
=end
Version data entries
10 entries across 10 versions & 1 rubygems