libxml2
1: Regexp: (\+|-)(0[0-9]|1[0-1]) 2: +01: Ok 3: -01: Ok 4: +10: Ok 5: -10: Ok 6: Regexp: [+-](0[0-9]|1[0-1]) 7: +01: Ok 8: -01: Ok 9: +10: Ok 10: -10: Ok