Class: Regexp

Inherits:
Object show all
Defined in:
lib/core/facets/regexp/arity.rb,
lib/core/facets/regexp/op_or.rb,
lib/core/facets/regexp/to_re.rb,
lib/core/facets/regexp/op_add.rb,
lib/core/facets/regexp/to_proc.rb,
lib/core/facets/regexp/multiline.rb

Instance Method Summary collapse

Instance Method Details

#+(other) ⇒ Object

Add regular expressions.

/a/ + /b/ == /(?-mix:a)(?-mix:b)/

Functionally equivalent to:

/ab/

CREDIT: Tyler Rick



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# File 'lib/core/facets/regexp/op_add.rb', line 12

def +(other)
  other = Regexp.escape(other) if other.is_a?(String)
  /#{self}#{other}/
end

#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

#multiline? ⇒ Boolean

Is a regular expression multiline?

/x/.multiline?   #=> false
/x/m.multiline?  #=> true

Returns:

  • (Boolean) 


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# File 'lib/core/facets/regexp/multiline.rb', line 8

def multiline?
  options & MULTILINE == MULTILINE
end

#to_proc ⇒ Object

Useful to pass a Regexp as a block that will match elements

%w[ joe_the_dog mary_the_cat ].index &/cat/ #=> 1

Returns [Proc] which passes it’s argument to Regexp#match method.



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# File 'lib/core/facets/regexp/to_proc.rb', line 9

def to_proc
  proc { |x| match(x) }
end

#to_re(esc = false) ⇒ Object

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



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# 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 ⇒ Object

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



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# File 'lib/core/facets/regexp/to_re.rb', line 10

def to_regexp
  self
end

#|(other) ⇒ Object

Operator form of ‘Regexp.union`.

/a/ | /b/  #=> /(?-mix:a)|(?-mix:b)/

If other is not a Regexp it is passed to Regexp.escape.



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# File 'lib/core/facets/regexp/op_or.rb', line 9

def |(other)
  other = Regexp.escape(other) unless Regexp === other
  Regexp.union(self, other)
end