Input Mask Mobile

This was made using

https://unmanner.github.io/imaskjs/guide.html

You can input a mask of your choosing following specific rules:

where definitions are:

• 0 - any digit
• a - any letter
• * - any char
• other chars which is not in custom definitions supposed to be fixed
• [] - make input optional
• {} - include fixed part in unmasked value
• ` - prevent symbols shift back

And the input will only allow you to type if you follow those rules.