Here is some Info :
((\D{1,2}.?\D{0,2}\S?) (X) \S?) {1,3} (MM|CM)
1st Capturing Group ((\D{1,2}.?\D{0,2}\S?) (X) \S?) 2nd Capturing Group (\D{1,2}.?\D{0,2}\S?) \D{1,2} matches any character that\'s not a digit (equal to [^0-9]) {1,2} Quantifier — Matches between 1 and 2 times, as many times as possible, giving back as needed (greedy) .? matches any character (except for line terminators) ? Quantifier — Matches between zero and one times, as many times as possible, giving back as needed (greedy) \D{0,2} matches any character that\'s not a digit (equal to [^0-9]) {0,2} Quantifier — Matches between 0 and 2 times, as many times as possible, giving back as needed (greedy) \S? matches any non-whitespace character (equal to [^\r\n\t\f\v ]) ? Quantifier — Matches between zero and one times, as many times as possible, giving back as needed (greedy) matches the character literally (case sensitive) 3rd Capturing Group (X) X matches the character X literally (case sensitive) matches the character literally (case sensitive) \S? matches any non-whitespace character (equal to [^\r\n\t\f\v ]) ? Quantifier — Matches between zero and one times, as many times as possible, giving back as needed (greedy) matches the character literally (case sensitive) {1,3} matches the character literally (case sensitive) {1,3} Quantifier — Matches between 1 and 3 times, as many times as possible, giving back as needed (greedy) matches the character literally (case sensitive) 4th Capturing Group (MM|CM) 1st Alternative MM MM matches the characters MM literally (case sensitive) 2nd Alternative CM CM matches the characters CM literally (case sensitive)
Possible Matches :
TIM AP X X MM
ABC AP X X CM
SAS AP X X MM
SASSAP X X MM
SAS IS X T CM
SAS IS X MM
ABC XY X Y CM
X B MM
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