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Regexp

Public Instance Methods

+(other) click to toggle source

Add regular expressions.

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

Functionally equivalent to:

/ab/

CREDIT: Tyler Rick

# File lib/facets/regexp/op_add.rb, line 12
def +(other)
  other = Regexp.escape(other) if other.is_a?(String)
  /#{self}#{other}/
end
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/facets/regexp/arity.rb, line 13
def arity
  source.scan( /(?!\\)[(](?!\?[#=:!>-imx])/ ).length
end
multiline?() click to toggle source

Is a regular expression multiline?

/x/.multiline?   #=> false
/x/m.multiline?  #=> true
# File lib/facets/regexp/multiline.rb, line 8
def multiline?
  options & MULTILINE == MULTILINE
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/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/facets/regexp/to_re.rb, line 10
def to_regexp
  self
end
|(other) click to toggle source

Operator form of `Regexp.union`.

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

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

# File lib/facets/regexp/op_or.rb, line 9
def |(other)
  other = Regexp.escape(other) unless Regexp === other
  Regexp.union(self, other)
end

[Validate]

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