Inefficient reaction SMARTS enumeration

[mmzdouc]

See https://github.com/mite-standard/mite_extras/security/code-scanning/3

@Adafede do you have a suggestion how to fix the regular expression?

[Adafede]

Maybe pattern = re.compile(r"\[([^\]:,]+(?:,[^\]:,]+)*)\:(\d+)\]") ?

I did not test it yet... if not working I guess we could use regex instead of re and possesive quantifiers or atomic grouping?