CODEWITHSUNDEEP
pythonregex
zhuyxn
zhuyxn

Reputation: 7081

Python: Regex to remove zeros preceded by letters?

Having a bit of trouble coming up with a regex statement for the following room numbers:

C001B --> C1B //remove "leading" zeros after first set of letters
C100B --> C100B
CB001B --> CB1B //remove "leading" zeros after first set of letters
001B --> 1B //remove leading zeros

Essentially, remove all zeros which is not preceded by a numeral?

Upvotes: 2

Views: 647

Answers (2)

Marcus
Marcus

Reputation: 6849

Find all patterns like 'ABC000', '000', and eliminate the '0's.

return re.sub( "([^0-9]+|^)0+", r'\1', raw )

Upvotes: 0

Dan
Dan

Reputation: 10786

Well, to match such zeros you could use a negative lookbehind, such as (?<![^a-zA-Z]), to ensure that the matched area is not preceded by anything but a letter. By inserting this before your match, it will ensure that whatever comes immediately before doesn't match the pattern contained, here [^a-zA-Z], which also counts for matches at the very beginning of a line.

re.sub("(?<![^a-zA-Z])0+","",number)

Upvotes: 3

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