Javascript if with a wildcard

Good morning. I have a snippet of javascript code that basically just turns on a new text box if a drop down box is selected. The code is specific to a certain number selected, so if 'A.0022684.1.1.4' is selected, it displays a new text box.

if (value == "A.0022684.1.1.4"){
          showElement(thatObject.name);

What I'd like to do is instead of using a specific number, Id like to use a wild card...so that if and number selected starts with 'A.' then the new text box will display. I'm no javascript whiz so I was hoping a wildcard could be used somewhat easily.

Thanks