osx - Reformat how a number is displayed in a line of text file with sed -

i have text file has several lines , looking replace lines formatted like:

cat: -0600, dog: +0900 cat: -1000, snake: -0500 cat: -0900 cat: +0100 

to say

cat: -6, dog: +0900 cat: -10, snake: -0500 cat: -9 cat: +1 

there other lines are:

dog: -0700 dog: +1000 

that shouldn't touched. i've searched, can't quite figure out. prefer use sed, unless there's better way.

given composite data file, script gives sample output below:

sed 's/^\(cat: [-+]\)0\{0,1\}\([1-9]\{0,1\}[0-9]\)00/\1\2/' data 

it looks cat: followed + or -, optional 0 (which not captured), optional [1-9] followed [0-9] followed 2 0's, , replaces 2 remembered parts. convert +0000 +0. if last 2 digits not 00, modify first regex match [0-5][0-9] or [0-9][0-9].

sample output:

cat: -6, dog: +0900 cat: -10, snake: -0500 cat: -9 cat: +1 dog: -0700 dog: +1000