Validate number of characters in a field with a message

New Here ,
Jan 23, 2018 Jan 23, 2018

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Greets, all:

I found this formula for validating the number of charcters in a field:

event.rc = (event.value=="" || /^\d{9}$/.test(event.value));

...but in my case I want to make sure there's only four characters in the field (for the year number). It's easy enough to see that I need to replace the 9 with a 4, however, how do I code it so if four digits aren't entered for the year a warning pops up that says, "You must enter a four-digit year"?

TIA for your help!

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Acrobat SDK and JavaScript, Macintosh

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Most Valuable Participant , Jan 23, 2018 Jan 23, 2018
Add this line after the first one:if (!event.rc) app.alert("You must enter a four-digit year.");

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Most Valuable Participant ,
Jan 23, 2018 Jan 23, 2018

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Add this line after the first one:

if (!event.rc) app.alert("You must enter a four-digit year.");

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Adobe Community Professional ,
Jan 24, 2018 Jan 24, 2018

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This script does not prevent the "0000" fake year…

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