telephone = '1234abc5678';
regex = /^[\s()+-]*([0-9][\s()+-]*){6,20}$/;
if (telephone.match(regex))
print("Telephone number is valid");
else
print("Telephone number is not valid");
telephone = '123 456 7890';
if (telephone.match(regex))
print("Telephone number is valid");
else
print("Telephone number is not valid");
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