Response Validation Examples
The response validation feature allows the creation of rules that restrict the format or length of a response to Google Form questions. Response validation will help you collect data in a consistent format and prevent unusable or inaccurate data from being submitted in a form. 

Here are several examples of how you might use response validation. 
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What is your name *
Please provide your full name
Email Address
Please provide an email that check regularly .
Writing Prompt
This question will not accept answers that are shorter than 30 characters. The "length" response validation option observes characters, not words. 
Which of the following are mammals? *
Required
Which of the following are mammals? *
Required
Which colors appear in the Google Logo? *
Required
What is the password? *
Note: this question requires the submission of case-sensitive value (pluto). 
Regular Expressions
Regular expression (regEx) is a string of text that specifies the format of a desired response. Regular expression rules can be written to limit responses to a 4-digit zip code (39387), the format of a phone number (123-456-7890), or state abbreviations (FL).

Response validation in Google Forms supports regular expression rules which means you can write a rule for virtually any type of response. 

To get started using regular expressions, check out RegExLib for a list of common rules. 
Example of a regular expression for phone number
Phone Number
Please enter your phone number with area code.

Note: this question requires the submission of 10 digits, but does not require a specific format. 
Phone Number *
Please enter your phone number like this: 222-222-2222

Note: this question requires a 10-digit submission in a specific format through the use of a regular expression.
Zip Code
Please enter your five digit zip code
Submit
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