Data Tinker
data-tinker / custom and edge values / with a pattern (####/##-@@)
With a pattern (####/##-@@) generator
A custom value, as in the rules. The parameter: # digit · @ letter · ? either · {yyyy} {MM} {dd} {HH}:{mm} · | another format.
Free, no sign-up and no limits. Everything is generated in your browser: nothing is sent anywhere.
What if it filled itself in?
With the Data Tinker extension there is no copying and pasting: it fills the whole form from a panel next to the page, with templates per form and rules for your own fields.
Add to Chrome freeAll generators
Profiles
Personal documents
Banking
Addresses and phones
Justice
Property and utilities
Vehicles
Dates and times
Texts
Technology
Test data: valid in format and check digits, but made up. A randomly generated number may match a real person's; do not use them on real systems.