Positive Lookbehind(?<=[-]\s) -the literal - (4510 / 558 / 2D16)
\sany whitespace character
Non-Capturing Group(?:ITA\s)? ?repeats the group contents below at most once:
ITAthe literal text ITA (case insensitive) \sany whitespace character
\w{3}any word character, repeated exactly 3 times
\sany whitespace character
\w{3}any word character, repeated exactly 3 times
\sany whitespace character
-the literal - (4510 / 558 / 2D16)
\sany whitespace character
\w{3}any word character, repeated exactly 3 times
\sany whitespace character
\w{3}any word character, repeated exactly 3 times
\sany whitespace character
\w{3}any word character, repeated exactly 3 times
\ban ASCII word boundary