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$time2 =~ s/^(\d{2})(\d{2})(\d{2})\.(\d{2}).+?/$1:$2:$3.$4/;
#!/usr/bin/perl # ... print "$time2\n"; __END__ 12:34:56.74768
s/^(\d{2})(\d{2})(\d{2})\.(\d{2})\d*/$1:$2:$3.$4/;