Question

The following is a sample string I’m using:

 http://www.asfradio.com/device.asp?u=username&p=password&s=east

Current checks I use in my code:

if (data.endsWith(".asf") || (0 < data.indexOf(".asf")))

So in this case my check fails because yes there is a .asf string but it’s followed by radio and that makes my logic bad since this link is not asf type…

What I want is a regular expression which returns true if “.asf” is found and the next character after “f” is not a letter.

Hopefully it make sence…

Answer 1

In Java’s regex engine, you have the word boundary anchor \b

Search for \\.asf\\b. In order to use that with String.matches(), you will have to wrap it with .*:

boolean found = inStr.matches(".*\\.asf\\b.*");

Better yet, store the compiled pattern in a constant:

private static final Pattern PATTERN = Pattern.compile("\\.asf\\b");

And use it like this:

boolean found = PATTERN.matcher(inStr).find(); // not .matches()