regex - Rename all '.' to '_' in a filename except for the extension -


I am trying to create a script which is all "." Events in a file name with "_" for example, when I try to change all the symbols, I use it: 

  rename 'y / / _ / '' {} 'File # test 1.2.jpg - & gt; Test_1.2.jpg   
 That works fine, but when I do it "." The extension of the symbol also changes:  
  Rename 'y /./_/' '{}' file # test 1.2.jpg - & gt; <1  
 Itemprop = "text"> 
 You can use a letterhead to replace all the points before the very last dot:  
  rename / \. (? = [^.] *.) / _ / G '' {} '  
 or using the negative eye head:  
  Rename / s (?)? [^^] $) / _ / G '' {} ''

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