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I want to define a rule that will change a particular type of string to another form. For example:- a string having R1~~"=C"~~"C"("OO|O")~~R2 -> R1~~"C"(O)~~"C"~~R2

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Could you post the complete example (i.e. with original and target string)? Plus, have you looked at the documentation of StringReplace? – Yves Klett Mar 26 '12 at 12:25
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What are the specific transformation rules you want to apply? – Brett Champion Mar 26 '12 at 16:04
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1 Answer

up vote 4 down vote

It is not quite clear what you are aiming to do, but perhaps this would work:

StringReplace["r1abc=CxxC(00)r2xyz",
 R1__ ~~ "=C" ~~ x___ ~~ "C(00)" | "C(0)" ~~ R2__ :> 
  R1 <> "C(O)" <> x <> "C" <> R2]

r1abcC(O)xxCr2xyz

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You can have a single RuleDelayed instead of two using ...~~"C(00)" | "C(0)"~~... – kguler Mar 26 '12 at 12:46
@ kguler - already put that in, thanks – Chris Degnen Mar 26 '12 at 13:05

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