Recently, a couple of clients have reached out to us regarding validation within their LiveBall forms. More specifically, how to:

1. Allow for a "+" prefix
2. Require a "+" prefix

Using “regular expressions” you can define how a field should be validated. LiveBall is pre-configured with validation for some basic fields — email, date, etc. However, you also can add your own validation: Integration > Data Collection > + Validation Pattern

HOW TO: Allow for "+" or area code beginning with "0"

^(\+[1-9][0-9]*(\([0-9]*\)|-[0-9]*-))?[0]?[1-9][0-9\- ]*$

Matches: +123(45)678-910 | +123-045-67 89 10 | 01-234-56-78
Non-Matches: 123(45)678 91011 | (12)345-678 | +0(12)345-6789 

Details & source

HOW TO: Require "+" 

^[+][0-9]\d{2}-\d{3}-\d{4}$

Matches: +974-584-5656 | +000-000-0000 | +323-343-3453
Non-Matches: 974-584-5656 | +974 000 0000

Details & source

For more validation patterns, visit: RegExLib.com