the timestamp looks unique to me so i would use its pattern
time
[0-9]{2}h:[0-9]{2}m:[0-9]{2}s
day
if the day is always folloed by <span id='RgSwInfodays'>
and has a length 1-3
[0-9]{1,3}(?= <span id='RgSwInfodays'>)
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solved How to extract system uptime from html using regular expression in C#