^(?!if\b|else\b|while\b|[\s\*])(?:[\w\*~_& ;]+?\s+){1,6}([\w:\*~_&]+\s*)\([^\);]*\)[^\{;] *?(?:^[^\r\n\{]*;?[\s]+){0,10}\{

#initial:
"^(?!if\b|else\b|while\b|[\s\*])(?:[\w\*~_&]+?\s+){1,6}([\w:\*~_&]+\s*)\([^\);]*\)[^\{;]*?(?:^[^\r\n\{]*;?[\s]+){0,10}\{"

#by pieces:
# 1.
"^(?!if\b|else\b|while\b|[\s\*]) # - on beginning DOES NOT have words: 'if','esle','while' or (' ' and '*')
                                 # I guess, '(?!' part means do not select this part (defined by stuff in '(...)')
# 2.
(?:[\w\*~_&]+?\s+){1,6}          # - allowed beginning: any alpha-numeric or '*','~','_' and '&' one or more (shortest) (by +?),
                                 #   followed by ' 's (1 or more) (so, should be a word) , repeating from 1 to 6 times
                                 # Again: '(?:' - do not save it in final selection
# 3.
([\w:\*~_&]+\s*)\([^\);]*\)      # world-chars(plus '*~_&) one+ times; space{0,} (saved as $1), followed by '(...)' without ';' inside
# 4.
[^\{;]*?                         # - no ';' and '{' - any time repeated, but shortest (by *?)
                                 # so, IS IT anything between <func_nm>(..)  and   {...}  ?  So, comments only?
# 5.
(?:^[^\r\n\{]*;?[\s]+){0,10}     # ????  - This I do not understand:
                                 # what is '^[^' ? - beginning and NOT-block?  How it could be beginning? Is it in multyline selection means
                                 # anything on new line?
                                 # After that the \r\n - so, line change.  After 'on beginning' no line change?! So, one new line is fine, but
                                 # two is not???  Seems, nonsense.  How to understand?
                                 #  - Followed by ';' ?!?!  Statement between <fnc_nm>(...) and {...} ?!?!?  - Nonsense?!?!
                                 # after that '?' -so, shortest?
                                 # - folowed by spaces, at least one; and it could be up to 10 times (but do not save it (by (?: on beginning)
                                 # This understanding seems to me unreasonable.
                                 # Help me to get it!
# 6.
\{"                              # Finaly, followed by '{'