We provide 4 wildcards to match zip codes, which are:
*: Match any number of characters?: Match a single character, e.g. 1?10 matches 1010, 1110, 1a10, etc.^: Starting character, used to identify the starting character, e.g. ^10 matches 10, 101, 1006, etc.$: Terminator, used to identify the ending character, e.g. 51$ matches 51, 1051, 151, etc.
If we want to match a 4-digit zip code that starts with 12, then we can write the following value:
^12??$
