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to do string substitutions in python, use the “re” module and the “sub” function:

>>> import re

>>> test = “2545423/1-4242:0.3245″

>>> test ; re.sub(“/\d-\d*:”,”:”,test)

and, to match a group and then use it in the substitution, use parentheses and the \<number> operation:

>>> new_boot_s = re.sub(“(\d+:)”,”n\\1″,boot_s)

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