import re input_string="x1,x2,Z3,x4,Z5,x6" re1 = re.compile("(?:x\d(,)?)+") # captures the general thing you want to match using a repeating non-capturing group re2 = re.compile("(x(\d)(,)?)") # your actual matcher def ordered_repl(m): # m is a matchobj buf1 = [] buf2 = [] cap_iter = re.finditer(re2,m.group(0)) # returns an iterator of MatchObjects for all non-overlapping matches for cap_group in cap_iter: capture = cap_group.group(2) # capture the digit buf1.append("X%s" % capture) # buffer X's of this submatch group buf2.append("O%s" % capture) # buffer O's of this submatch group return "%s,%s," % (",".join(buf1),",".join(buf2)) # concatenate the buffers and return print re.sub(re1,ordered_repl,input_string).rstrip(',') # searches string for matches to re1 and passes them to the ordered_repl function
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