Regex

[joshua antony]

String  str = ".*+hello";
Pattern p   = Pattern.compile( str );
Matcher m   = p.matcher( "whellow.*wwwwwhello" );
 
while( m.find())
{
System.out.println( "position :" + m.start() + "   groups: " + m.group());
}

Why am I not getting any output in the above case?

[Dave McIntyre]

The quantifier *+ is a possessive quantifier. From the API:

Possessive quantifiers, which greedily match as much as they can and do not back off, even when doing so would allow the overall match to succeed.

So the .*+ matches as much as it can (which is the whole of the string) and there is none of the string left to match the "hello" part of the pattern.

[joshua antony]

Thanks Dave