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lang-bash
-Eoptiongrepwouldn't do much? This would explain quite a lot, for example why I wasted so much time looking for where I was wrong!+operator.. I'll post examples too.grep -E '(.)\1{2}'does not exactly "Find matches with exactly 3 matches". While it will match exactly three identical characters, they may be embedded in a longer repeated string; e.g., it will match in the 5-symbol stringAAAAA. (And if there are 6 or more consecutive symbols, it will match more than once).