I want to have respondents enter their phone # contact information (US) with fields for the area code (xxx), prefix xxx, a "-" character, suffix xxxx and ext. (up to 8 characters). Is there a way to have separate validation expressions for each field. In other words, can I have a before and after () for the area code but only allow the #s 2-9 as the leading digit for the area code; only allow 3 digits for the prefix with the leading digit from 2-9; only allow 4 digits for the suffix.

Do you mean that you need other validation than regex available here ?

I'm new to LimeSurvey and JavaSript, trying to "learn on the fly". I'm trying to create an array (texts or numbers) question with home/cell/work/other on the y-scale and area code, prefix, suffix, and ext on the x-scale. I wanted to have separate validation expressions for each of the area code, and prefix fields as well as only allow integers for all fields.

I wasn't sure if this was just too complicated for me to attempt and I should just enter the full # as one field with a separate field for the ext. In that case, I wasn't sure how to include the phone # validation expression for just the phone # fields and not the ext. fields.

"Validation can be applied to individual cells within an array, such as this example where regular expression validations ensure that each entry is a properly formatted US phone number including area code. "

Found here

On the other hand, you can use 4 (home/cell/work/other) separate (text) questions with one of the regular expression provided above. It's easier and much better for small devices users

Thanks for your help! I'm still a little confused on how to enter the validation codes if I use separate text questions for home/cell/etc. If for example the home # question is an array (number or texts)question type and I want different validation expressions for the area code, prefix, and suffix fields; how do I separate the expressions for each filed? Would it be in the subquestion validation expression box and if so what syntax is used to ensure each expression checks the correct field.

I can't provide you the requiered expressions because I know very few things on how to set regex

Maybe you can have a look inside the complete regex for us phones, and try to retrieve some components...
For example, I think that the following expression, can validate a number from 200 to 999 (not tested):
Try it in a "subquestion validation expression box"