What is the best way to ensure that at least one of the two user inputs matches the specified regex pattern?

I am facing a challenge with regular expressions for zip codes from two different countries - The Netherlands and Belgium.

For The Netherlands:

.match(/^[1-9][0-9]{3} ?(?!sa|sd|ss)[A-Za-z]{2}$/g)

For Belgium:

.match(/^[1-9]{1}\d{3}$/g)

Users should be able to input either a Dutch zip code or a Belgian zip code, such as 1111 AA (Netherlands) or 1111 (Belgium). I have been attempting to create a regex pattern to allow for either input, but I haven't been successful so far.

This is my current attempt:

.match(/^(?:[1-9]{1}\d{3}) | ([1-9][0-9]{3} ?(?!sa|sd|ss)[A-Za-z]{2}$)/g)

However, this pattern seems to be causing issues and doesn't validate either of the two types of zip codes. Could it be that I am not using the OR operator correctly?

javascriptregex

Answer №1

It appears that there may be a mistake with the spaces surrounding the alternation in your expression. However, you can simplify it by using an optional non-capture group instead:

^[1-9]\d{3}(?: ?(?!s[ads])[A-Z]{2})?$

For a demonstration, check out this demo

  • ^ - Denotes the start of the line;
  • [1-9]\d{3} - Matches a digit from 1 to 9 followed by three more digits;
  • (?: - Begins a non-capturing group;
    • ?(?!s[ads]) - A space character followed by a negative lookahead to ensure the position is not followed by 's' with 'ads';
    • [A-Z]{2} - Matches two alphabetical characters;
    • )? - Ends the non-capture group and makes it optional;
  • $ - Denotes the end of the line.

Please note that this matching process is case-insensitive.

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