regex for zip-code

Question

Possible Duplicate    What is the ultimate postal code and zip regex        I need Regex which can satisfy all my three condtions for zip-code   E g-    12345  12345-6789 12345 1234   Any pointers and suggestion would be much appreciated  Thanks

User · Answer

I know this may be obvious for most people who use RegEx frequently, but in case any readers are new to RegEx, I thought I should point out an observation I made that was helpful for one of my projects.

In a previous answer from @kennytm:

^\d{5}(?:[-\s]\d{4})?$

…? = The pattern before it is optional (for condition 1)

If you want to allow both standard 5 digit and +4 zip codes, this is a great example.

To match only zip codes in the US 'Zip + 4' format as I needed to do (conditions 2 and 3 only), simply remove the last ? so it will always match the last 5 character group.

A useful tool I recommend for tinkering with RegEx is linked below:

https://regexr.com/

I use this tool frequently when I find RegEx that does something similar to what I need, but could be tailored a bit better. It also has a nifty RegEx reference menu and informative interface that keeps you aware of how your changes impact the matches for the sample text you entered.

If I got anything wrong or missed an important piece of information, please correct me.

User · Answer

For the listed three conditions only  these expressions might work also     d 5  - s      d 4        0-9  5  - s      0-9  4        0-9  5  - s      d 4       d 5  - s      0-9  4       Please see this demo for additional explanation   If we would have had unexpected additional spaces in between 5 and 4 digits or a continuous 9 digits zip code  such as   123451234 12345 1234 12345  1234   this expression for instance would be a secondary option with less constraints     d 5   -   s     d 4       Please see this demo for additional explanation   RegEx Circuit  jex im visualizes regular expressions     Test   x000D   x000D  const regex      d 5  - s      d 4     gm  x000D  const str    12345 x000D  12345-6789 x000D  12345 1234 x000D  123451234 x000D  12345 1234 x000D  12345  1234 x000D  1234512341 x000D  123451   x000D  let m  x000D   x000D  while   m   regex exec str       null    x000D         This is necessary to avoid infinite loops with zero-width matches x000D      if  m index     regex lastIndex    x000D          regex lastIndex    x000D        x000D       x000D         The result can be accessed through the  m -variable  x000D      m forEach  match  groupIndex    gt    x000D          console log  Found match  group   groupIndex     match     x000D          x000D    x000D   x000D   x000D

User · Answer

d 5     - s  d 4            Start of the string   d 5    Match 5 digits  for condition 1  2  3            Grouping  - s    Match a space  for condition 3  or a hyphen  for condition 2   d 4    Match 4 digits  for condition 2  3         The pattern before it is optional  for condition 1      End of the string

[regex] regex for zip-code

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