Parsing a date format with regex

Question

Using rubular http://rubular.com/ I'm trying to parse the hours minutes and seconds from a format 4H40M20S

So far I have this

(\d*)H(\d*)M(\d*)S

Which works fine for 4H40M20S but not for 40M20S

What do I need to change to get it to work in this case?

Answer 1

Looks like you're after something like:

([\d]+[HMS])+

Debuggex Demo

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If you want to capture each section seperately, then use:

([\d]+H)?([\d]+M)?([\d]+S)

Debuggex Demo