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Regex - Leading zeros

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Compilation time: 0.06 sec, absolute running time: 0.12 sec, cpu time: 0.11 sec, average memory usage: 16 Mb, average nr of threads: 4 
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000003923892 is vaild string False
000003923892 is vaild string False
0003923892 is vaild string True
003923892 is vaild string True
03923892 is vaild string True
3923892 is vaild string True