Question

QUESTION:

Write regular expressions after the ► to validate the following inputs:

a) Product codes that have one or more letters followed by one or more digits.

►

b) Nonnegative integers between 1,000 and 9,999, including the comma.

►

c) Canadian zip code containing upper case characters only.

►

d) License plate numbers that have the form:

         Letter

         Digit

         Letter

         Hypen (-)

         Digit

         Letter

         Digit

►

Answer 1

Regular expressions in different laguages are similar expect the minor syntaxes.

a) Product codes that have one or more letters followed by one or more digits.

► "\^[a-zA-Z][0-9]\" :

Explanation: The product code should be like first one or more letters and followed by one or more numbers. First must be letter so, We have written a-z and A-Z letters can be smaller or capitals. then followed by numbers 0-9.

b) Nonnegative integers between 1,000 and 9,999, including the comma.

►"\^[123456789][,][0-9][0-9][0-9]\"

Explanation: Here We cannot give directly as 1000-9999 in square brackets. We can only give range 0-9, so with these the first digit should be 1 - 9 so we have taken this. then followed by a , then next three digits can be any between 0-9.

c) Canadian zip code containing upper case characters only.

►"\^[0-9A-Z]{2,}\"

Explanation: Canadian Zip code may consits numbers. And all letters must be capital so. We have taken 0-9 for any number and A-Z for capital letters. And I am assuming the postal code at least has 2 characters of length so you can change this accordingly.

d) License plate numbers that have the form:

         Letter

         Digit

         Letter

         Hypen (-)

         Digit

         Letter

         Digit

►"\^[a-zA-Z][0-9][a-zA-Z][-][0-9][a-zA-Z][0-9]\"

Explanation: As said above a-z and A-Z in square brackets indicates letter and a 0-9 indicates a digit.