Formating variable with caracter and date.

[Dolphin06]

Hello all,

I would like to give a variable a value which have a format like this one:
<3 letters>-<date>-<digit>
<date> should be yymmdd.  Date of the day by default.
How would i do this, i know the date command is date +"%y-%m-%d", but i dont
know the syntax for mixing letters date and digit into one variable.
Also i would like to give the user a chance to change this default value, by
letting him enter one, so i would like to know how can i check if the
entered value is in the correct format.

Thank you for helping.
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