Is that possible to extract a time in text, such as "09:30" from a property with regular express and test it

I put some sort of information in one property such as time and some self defined keywords. the reason I do that is I don’t want to create too many properties for some similar properties. is that possible I can extract , for example, the time string with regexp and test if it’s less than such as “10:00”? thank you in advance !
keywords like walk-4, walk-5 means walk 4Km 5km