python - change string during pyparsing -

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In my pyparsing code I have the following expressions: 

  exp1 = literal ( "foo" ) + pressing (literally ( "=")) + words (alphanums + '_-') exp2 = literal ( "foo") + press (literally ( "! =")) + words (alphanums + '_-') Exp = optional (exp1) & amp; Optional (exp2)   
 I want to change the foo from bar to exp2, so that I'm in perced data = and! Is it possible to differentiate between =?   
 
 
 The comments of Karl Connectchtel are valid, but you do not want to change a token Pars can do this in action  
  def changeText (s, L, T): .. Return "boo" + t [0] expr = literal ( 'A') setParseAction (changeText) + "B" print expr.parseString ( "AB"). AsList ()   
 will be printed:  
  [ 'booA', 'b']   
 If you continue If you want to change the expression with the literal string, then  replace :  
  expr = literal (".") SetParseAction (replaceWith ("A to Z")) + 'B' print expr.parseString ("AB") asList ()   
 Print:  
  ['Z', 'B']

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