Use RegEx in R to retrieve string before second occurence of a period ('.') -

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Regularly get the characters before the second period (such as with sup ()). Looking at a character vector such as: 

  v   
 I want to return it to:  
 [1 ] "M_s.E1" "m_xs.P1"   
 
 
  & gt; Sub ("(^ [^.] + [.] [^.] +) (. + $)", "\\ 1", v) [1] "m_s.E1" "m_xs.P1" >  
 To illustrate it now: Mark any of the symbols in the first and third coupled  "[]"  except for any period ("character squares"), And "+" that follow them, let them have an arbitrary number of such characters.  [.]  This only matches the first period, and the second period will end the match. Pannerethase-pair allow you to have special partial squares of matching characters and there are two sections. In the second section, an arbitrary number is repeated by the end of any character (symbol of the term) string,  $   "\\ 1"  back as the value only the first partial Specifies matching.  
  ^  Operator means different things inside and outside the square brackets. Outside refers to the length-zero beginning of the string. At the beginning of the characterization of a character class, this is a prohibition operation.  
 This is a good use case for "class squares", which is described in the help page found by typing:  
 ? Regex

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