Regular expression

[Krik]

Hi, all.
I have the brightest question of the month: how would I check my code for the list of string regular expressions? (I want to prevent the possibility of user asking question with unassigned symbols(

Here is the list, for example - the purpose is to ask the user "what do you want on your sandwich"
Then he is given the list, let's say, "ketchup", mayonnaise."
How would I prevent him from entering, let's say, "shoes", or just a bunch of numbers ....

I figured out it should be regular expressions, I still don't know how to incorporate it into my code. When I tried to solve the problem with boolean logics, the program crushed for example, if customer should make one choice out of "no" and two ingredients ... I couldn't find a way to fix it.

so any ideas would be great.
Thanks.

[KevinWorkman]

I'm not sure how regular expressions would help you here.

If you have a finite amount of valid responses, add them all to a List. When the user enters a choice, make sure what they chose is in the List. If it's not, it's not a valid choice.

Or you could use a drop-down box JComboBox instead of having them enter free text, but that's only valid if you're using a GUI.

[DarrylBurke]

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[DarrylBurke]

Or you could use a drop-down box JComboBox instead of having them enter free text, but that's only valid if you're using a GUI.

And if this is a command line application, you could display a menu with the valid choices each on its own line with a serial number and prompt the user to enter a number rather than a word.

db