RegEx Validation for Custom field

revjoe · 05-21-2026, 06:14 PM

Is it possible to perform regex validation on a custom field when entries are added?

I have a custom field that stores comma separated values that represent BISAC codes. I would like to run a regex against them to ensure that they match the convention of three alpha characters followed by 6 digits.

I have the regex, but is there a way to apply this to values in a custom field?

I looked at the search_template fields, but it feels like validation and search function should be different.

Failing this, I can implement it as a search or a plugin if I need to.

Thanks

Joe

kovidgoyal · 05-21-2026, 09:52 PM

No, you would need to use a plugin to validate values post entering them.

revjoe · 05-22-2026, 10:53 AM

ok.. Thanks for the input.

I will dig into that a bit.

Thanks again.

05-21-2026, 06:14 PM	#1
revjoe Member Posts: 11 Karma: 10 Join Date: Jul 2011 Device: none	RegEx Validation for Custom field Is it possible to perform regex validation on a custom field when entries are added? I have a custom field that stores comma separated values that represent BISAC codes. I would like to run a regex against them to ensure that they match the convention of three alpha characters followed by 6 digits. I have the regex, but is there a way to apply this to values in a custom field? I looked at the search_template fields, but it feels like validation and search function should be different. Failing this, I can implement it as a search or a plugin if I need to. Thanks Joe

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05-21-2026, 09:52 PM	#2
kovidgoyal creator of calibre Posts: 46,291 Karma: 29630860 Join Date: Oct 2006 Location: Mumbai, India Device: Various	No, you would need to use a plugin to validate values post entering them.

05-22-2026, 10:53 AM	#3
revjoe Member Posts: 11 Karma: 10 Join Date: Jul 2011 Device: none	ok.. Thanks for the input. I will dig into that a bit. Thanks again.