New answers tagged replace
With your regular expression you are recognizing: "RvA_X-IRB-il-CA101-RvA_X-IRB+020000-20150327212332-055582-P" in part because you are using \1 as others have pointed out. Note the repeated "RvA_X-IRB". However, it could be important to note that you are using "\b" as well, and this is going to work only when you do have a "non-word" character in one ...
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