How to find if a Java String contains X or Y and contains Z

Question

I\'m pretty sure regular expressions are the way to go, but my head hurts whenever I try to work out the specific regular expression.

What regular expression do I ne

Answer 1

If you're not 100% comfortable with regular expressions, don't try to use them for something like this. Just do this instead:

string s = test_string.toLowerCase();
if (s.contains("parsing") && (s.contains("error") || s.contains("warning")) {
    ....

because when you come back to your code in six months time you'll understand it at a glance.

Edit: Here's a regular expression to do it:

(?i)(?=.*parsing)(.*(error|warning).*)

but it's rather inefficient. For cases where you have an OR condition, a hybrid approach where you search for several simple regular expressions and combine the results programmatically with Java is usually best, both in terms of readability and efficiency.