Class: String

Inherits:
Object
  • Object
show all
Defined in:
lib/ackr/extensions/string.rb

Instance Method Summary collapse

Instance Method Details

#to_regexp ⇒ Object

Public: Transform itself in a Regexp.

Returns a Regexp if successful, nil otherwise.

Credit to Josh Cheek: www.ruby-forum.com/topic/193809

Note: there is also a gem:

https://github.com/seamusabshere/to_regexp 
Could be useful if I later want to parse things like
  $ ackr %r{regexp}
or if bugs are discovered in the following code.



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# File 'lib/ackr/extensions/string.rb', line 16

def to_regexp
  return nil unless self.strip.match(/\A\/(.*)\/(.*)\Z/mx)
  regexp , flags = $1 , $2
  return nil if !regexp || flags =~ /[^xim]/m

  x = /x/.match(flags) && Regexp::EXTENDED
  i = /i/.match(flags) && Regexp::IGNORECASE
  m = /m/.match(flags) && Regexp::MULTILINE

  Regexp.new regexp , [x,i,m].inject(0){|a,f| f ? a+f : a }
end