Non-Capturing Group(?:CONTA|C/C)? ?repeats the group contents below at most once:
CONTAthe literal text CONTA (case sensitive) C/Cthe literal text C/C (case sensitive) Non-Capturing Group(?:\sCORRENTE)? ?repeats the group contents below at most once:
\sa Unicode whitespace character
CORRENTEthe literal text CORRENTE (case sensitive) \s?optionally matches a Unicode whitespace character
Non-Capturing Group(?:PJ)? ?repeats the group contents below at most once:
PJthe literal text PJ (case sensitive) \s?optionally matches a Unicode whitespace character
:?optionally matches the literal : (5810 / 728 / 3A16)
\s?optionally matches a Unicode whitespace character
\d+a Unicode decimal digit, repeated at least once
?matches at most one character from the set below:
-the literal - (4510 / 558 / 2D16)
.the literal . (4610 / 568 / 2E16)
/the literal / (4710 / 578 / 2F16)
\d+a Unicode decimal digit, repeated at least once
g modifier: global. Finds all matches instead of stopping after the first
m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string