Groovy/Grails: Get key:value pairs satisfying a regexp -

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I have a map and want to get all the keys: Add value where the key corresponds to a regular expression I have A solution where I find the key (for the key) and loop first through grep. But there should be a simple solution (or I'm hoping).

Ex: 

  def qmap = [name: "hair", style: 'direct', color_1  
 : 'brown' , Color_2: 'blonde', color_3: 'black']   
 I would like to get a submap with colors only.  def color = [color_1: 'brown', color_2: 'blonde', color_3: 'black']   
 I can get keys using .grep, but it Only gives me the keys and I need a loop to get value.  
  def colorKeys = qmap.keySet (). Grep (~ / ^ color. * /)   
 How to do any idea?   
 
 
 you can  
  qmap.subMap (colorKeys)

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