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print(   "1  " =~ /\d{0,3}/   ?"match":"no match", $/);
print(   "12 " =~ /\d{0,3}/   ?"match":"no match", $/);
print(   "  1" =~ /\d{0,3}/   ?"match":"no match", $/);
print(   "   " =~ /\d{0,3}/   ?"match":"no match", $/);