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Your LimeSurvey version: 3.28.29
Own server or LimeSurvey hosting: Own
Survey theme/template: vanilla
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I'd like to use multiple short text to collect a phone number and email address. I'm looking for a way to:
a) Show a placeholder in each input box to indicate the format of input
b) Validate the input:
   i) Verify email has a validate format
   ii) Verify phone number is numeric and contains two hyphens in the proper locations
Ideally, I'd like to apply a mask for the phone number so user can type digits only, and end up with an input in the format ###-###-####

I've attached my multiple short text question -- hoping maybe someone already has a solution for this.

Hi,
you can use the plugin "jquery mask" from Igor Escobar.
[url] igorescobar.github.io/jQuery-Mask-Plugin/ [/url]

Here an image of my Tutorial "Gimmicks und andere..."
 


Or the plugin "Inputmask"
[url] github.com/RobinHerbots/Inputmask [/url]
 
Here you can use a regex inside the mask or a "greedy" mask to validate the email format.

Unfortunately you did not provide a lss export, only lsq.
So I can't provide a workig example.

Joffm