Question

We have a string input and the following combinations are valid (e.g. sunday, *sunday*, sun*day*, *sun*day, su*nda*y)
If it contains only a single asterisk, then it is a bad input.

So given the above input, how do I check to see if the string contains multiple asterisks.

Answer 1

You could use String.matches with a regular expression:

"^.*(?:\\*.*){2}$"

If you want exactly two asterisks:

"^[^*]*(?:\\*[^*]*){2}$"

Though for this task it might be simpler just to iterate over the string and count the asterisks.