Match a string against multiple regex patterns

Question

I have an input string.

I am thinking how to match this string against more than one regular expression effectively.

Example Input: ABCD

Answer 1

If you have just a few regexes, and they are all known at compile time, then this can be enough:

private static final Pattern
  rx1 = Pattern.compile("..."),
  rx2 = Pattern.compile("..."),
  ...;

return rx1.matcher(s).matches() || rx2.matcher(s).matches() || ...;

If there are more of them, or they are loaded at runtime, then use a list of patterns:

final List rxs = new ArrayList<>();


for (Pattern rx : rxs) if (rx.matcher(input).matches()) return true;
return false;