Merge several regular expressions into one RE

Question

I have written 2 REs to match several string sequences in a String. for e.g. lets assume the two regular expressions are RE1, RE2. The strings can be i

Answer 1

I thought of using 'or' | but the problem with that is regex will stop matching once it finds the first matching sequence and not continue to find others.

That's what re.findall is for.

>>> import re
>>> RE = r'(?:\d{1,3}[a-zA-Z]?/\d{1,3}[a-zA-Z]?)|(?:\babc\b)'
>>> string = '*some string* 100/64h *some string* 120h/90 *some string* abc 200/100 abc *some string* 100h/100f'
>>> re.findall(RE, string)
['100/64h', '120h/90', 'abc', '200/100', 'abc', '100h/100f']

Note the usage of non-capturing parentheses (the (?:...) stuff). If the regex used capture-grouping parentheses as normal, re.findall would return [('100/64h', ''), ('120h/90', ''), ('', 'abc'), ('200/100', ''), ('', 'abc'), ('100h/100f', '')].