Checking the format of a postal code or zipcode using a regular expression

Question

Checking the format of a postal code or zipcode using a regular expression

My goal is to validate zip codes or pin codes in address fields. As a result, I am working on writing a regular expression that only allows characters a-z (upper and lower case), digits 0-9, round brackets (e.g. ()), hyphens -, and spaces. However, there are some specific rules that must be followed, such as a single white space not being allowed in the first position, and two or more white spaces not being allowed.

Here are some examples of invalid entries:

1254588
125  255
((125))  255
125--255
(125) (255)
125>2458
EL$ 2458
@L$ 2458

javascript regex validation

Answer 1

Answer №1

When considering only the essential rules, the solution is straightforward:

^                  # Beginning of input
(?! )              # First character cannot be a space
(?!.*  )           # No consecutive spaces allowed
[A-Za-z0-9 ()-]*   # Match any combination of the permitted characters
$                  # End of input

Alternatively, for JavaScript:

/^(?! )(?!.*  )[A-Za-z0-9 ()-]*$/

It seems like you may not want to match strings such as "))))((((", "-------", "A", or even "" which technically meet the criteria but may not align with your intended rules.

Answer 2

When considering only the essential rules, the solution is straightforward:

^                  # Beginning of input
(?! )              # First character cannot be a space
(?!.*  )           # No consecutive spaces allowed
[A-Za-z0-9 ()-]*   # Match any combination of the permitted characters
$                  # End of input

Alternatively, for JavaScript:

/^(?! )(?!.*  )[A-Za-z0-9 ()-]*$/

It seems like you may not want to match strings such as "))))((((", "-------", "A", or even "" which technically meet the criteria but may not align with your intended rules.

Checking the format of a postal code or zipcode using a regular expression

Answer №1

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