Validation Rules
Please check snapshot below to use this validaton methods. Required validation : When you need to make field required. Just tick required field in contact form 7 (Snapshot below) Email validation : When you need to validate email address. Just use Contact Form 7 email field Url validation : When you need to validate urls. Use class url. Validates : http://www.example.com Date validation : When you need to validate date. Use class date. Validates : 2015-03-12 Number validation : When you need to validate only numbers. Use class number. Validates : 7645.46 Digit only validation : Only accepts digits. No decimals accepted. Use class digits. Validates : 7645 Credit Card validation : When you need to validate credit card number. Use class creditcard. Validates: 5520010511051954 US Phone number validation : When you need to validate US Phone number. Use class phoneUS. Validates: 837-345-3456 Following validation methods are only available in Pro version. Minimum Number : Minimum numeric value user can input. Like: Age must be 18+. Use class JVmin-#. Where # is minimum numeric value required. Maximum Number : Maximum numeric value user can input. Like: Age mustt not be above 100. Use class JVmax-#. Where # is maximum numeric value required. Minimum Length : Minimum length user can input. Like: Name should be atleast 3 characters long. Use class JVminlength-#. Where # is minimum length required. Maximum Length : Maximum length user can input. Like: Name shouldn't exceed more than 30 characters. Use class JVmaxlength-#. Where # is maximum length allowed. Range Length : Minimum and maximum number of characters user can input. Like: username should atleast 3 and not more than 20 characters. Use class JVrangelength-#-. Where # is minimum length required and is maximum length allowed. Range : Minimum and maximum number value user can input. Like: Age should between 18 - 60. Use class JVrange-#-. Where # is minimum numeric value required and is maximum numeric value allowed. Equal To : When you need to ask same value similar to previous element. Like: Password Confirmation Use class JVequalTo-##########. Where ########## is the field name you want to tally with. JVextension : Only allow certain files format for user to upload. Like : jpg, png only. Use class JVextension-ext1_ext2_ext3. Where ext1, ext2, ext3 are the file extension you allow user to upload. JVrequireGroup : When given number of fields in a group need to be required. Like: Within a group of three phone numbers, ensure at least one is complete Use class JVrequireGroup-#_GROUPNAME. Where # is no of fields uses must fill up from the group and GROUPNAME is a field group name. Like: phonenumbers

Validation Rules

Please check snapshot below to use this validaton methods.

Required validation : When you need to make field required.
Just tick required field in contact form 7 (Snapshot below)
Email validation : When you need to validate email address.
Just use Contact Form 7 email field
Url validation : When you need to validate urls.
Use class url. Validates : http://www.example.com
Date validation : When you need to validate date.
Use class date. Validates : 2015-03-12
Number validation : When you need to validate only numbers.
Use class number. Validates : 7645.46
Digit only validation : Only accepts digits. No decimals accepted.
Use class digits. Validates : 7645
Credit Card validation : When you need to validate credit card number.
Use class creditcard. Validates: 5520010511051954
US Phone number validation : When you need to validate US Phone number.
Use class phoneUS. Validates: 837-345-3456

Following validation methods are only available in Pro version.

Minimum Number : Minimum numeric value user can input. Like: Age must be 18+.
Use class JVmin-#. Where # is minimum numeric value required.
Maximum Number : Maximum numeric value user can input. Like: Age mustt not be above 100.
Use class JVmax-#. Where # is maximum numeric value required.
Minimum Length : Minimum length user can input. Like: Name should be atleast 3 characters long.
Use class JVminlength-#. Where # is minimum length required.
Maximum Length : Maximum length user can input. Like: Name shouldn't exceed more than 30 characters.
Use class JVmaxlength-#. Where # is maximum length allowed.
Range Length : Minimum and maximum number of characters user can input. Like: username should atleast 3 and not more than 20 characters.
Use class JVrangelength-#-*. Where # is minimum length required and * is maximum length allowed.
Range : Minimum and maximum number value user can input. Like: Age should between 18 - 60.
Use class JVrange-#-*. Where # is minimum numeric value required and * is maximum numeric value allowed.
Equal To : When you need to ask same value similar to previous element. Like: Password Confirmation
Use class JVequalTo-##########. Where ########## is the field name you want to tally with.
JVextension : Only allow certain files format for user to upload. Like : jpg, png only. Use class JVextension-ext1_ext2_ext3. Where ext1, ext2, ext3 are the file extension you allow user to upload.
JVrequireGroup : When given number of fields in a group need to be required. Like: Within a group of three phone numbers, ensure at least one is complete Use class JVrequireGroup-#_GROUPNAME. Where # is no of fields uses must fill up from the group and GROUPNAME is a field group name. Like: phonenumbers

Instructions
You can add validation rules like url, date, dateiso, number, digits, creditcard, phoneUS from the class field of contact form 7. Check the snapshot below.