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Asked: 2026-05-22T18:22:34+00:00

I create a text field for adding tags separated by commas. (e.g. php, jquery,

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I create a text field for adding tags separated by commas. (e.g. php, jquery, js, ruby on rails) The field is like the one on stakoverflow where you add tags for posts.

I want to validate the input to ensure that tags have been entered correctly. This means that users may enter only letters, numbers, spaces, and commas.I made the following regex_match but I’m not entirely sure if it’s correct.

regex_match[/^[a-z, ]+$/i]

If the input contains anything but what I added in the regex I get a validation error when I submit the form. I have tested and it works when I put symbols like ' " ; \

This is my first regex, am I doing it right? The language is PHP.

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1 Answer

  1. Editorial Team

    OK, there are a few problems here:

    1. There is no php function called “regex_match”
    2. a function uses (), not []
    3. variables start with $. The inside of [] is an index.

    The line you posted will result in a syntax error in PHP. Since you “tested it”, it means this is not really the code you used. Please post the actual code.

    About the regex, it’s a good first try, but you forgot the numbers:

    /^[a-z,0-9 ]+$/i
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