Validate string using Regex

[rahul_raj1981]

hi,

I want to validate that the below string should only contain 0-9A-Za-z. Not sure how the space can be ignored and through the invalid message if it contains -

Please help

import re
inp1="input should only contain a to z 1 to 9 A to Z-"
if not re.search('[0-9A-Za-z]',inp1):
    print "input invalid"
else:
    print "input is valid"

Thanks in advance!