Using Regular Expression (regex) in Java Programming

[lordelf007]

Hiii all,

I'm new in using Regular Expression in Java.

For example, I have String s like this:

String s = "Why John Smith and Alan Smith and Nick Gates are the same?"

How can I get sub-strings as "John Smith", "Alan Smith", "Nick Gates" - (names of people - with first upper character) from s by using regex?

I try to use regex in Java, but It totally doesn't work.

This is my code:

/*
String EXAMPLE_TEST = "Why John Smith and Alan Smith and Nick Gates are the same?";
System.out.println(EXAMPLE_TEST.matches("([A-Z]&&[a-z])"));
String[] splitString = (EXAMPLE_TEST.split("([A-Z]&&[a-z])"));
System.out.println(splitString.length);
for (String string : splitString) {
System.out.println(string);
}
 
*/

Please help me to have exact "regex" in this case.

Thanks all in advance!

[jkmyoung]

I think it's something like:
"\ ([A-Z][a-z]+\ [A-Z][a-z]+)"

Added a space in the beginning so that you don't get "Why John" as your first match.

[lordelf007]

hii jkmyoung,

I tried your regex. It seems to be worked, but It just prints out other words like this:
"Why,
and,
and,
are the same ?"

Can I print these words: "John Smith", "Alan Smith", "Nick Gates" ?

[lordelf007]

thanks jkmyoung very much!

I figured out by using matcher.group():

Pattern pattern = Pattern.compile(" [A-Z][a-z]+ [A-Z][a-z]+");
Matcher matcher = pattern.matcher("Why John Smith and Alan Smith and Nick Gates are the same?");
while( matcher.find() )
System.out.println("main: "+matcher.group());

[pbrockway2]

If this is anything other than homework then you're going to have problems with the likes of Old MacDonald, Rip van Winkle and Stephen J Gould.