'How replace specified group content by re?

I have a string like this:
'[keep]:{[br]<stat>:"{status:[error]}",[br]<tool>:"{tools:[C245]}",[br]<temp>:"489",[br]<setT>:"45"}'

And want replace 45 to 100.The final string will be:
'[keep]:{[br]<stat>:"{status:[error]}",[br]<tool>:"{tools:[C245]}",[br]<temp>:"489",[br]<setT>:"100"}'

I use re.sub(r"setT.+?(\d+)", r"100", s), but it work incorrectly.Can someone know how to do?

python-3.x

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'How replace specified group content by re?

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