Work like a charm!! Big Thanks!!
I added $String .= $String for ( 1..4 ) and run the test. Yours cost 0sec while mine took 6secs. Totally be defeated.
This also reminds me that mastering regex is really another great topic, though I can read and understand your code, but believe thaz quite far to figure out one like this by myself! Thank you very much again! =)
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