将带有正则表达式的匹配的一部分插入替换文本中

Question

I have some text:

String s = "The Moon is an astronomical body.it is the fifth-largest natural satellite in the Solar System. the Moon is second-densest satellite among those whose densities are known."

And I want to uppercase every character which is after dot or after dot+space, using replaseAll method.

s = s.replaceAll("((?<=\\.|\\.\\s)\\p{Lower})","$1".toUpperCase());

Everything is ok, except of toUpperCase() . It doesnt do anything. Why? And how can I make it to work?

Answer 1

Note: Using your same pattern (you can improve your pattern)

import java.util.regex.*;

...

StringBuffer str = new StringBuffer( "The Moon is an astronomical body.it is the fifth-largest natural satellite in the Solar System. the Moon is second-densest satellite among those whose densities are known." );
Pattern p = Pattern.compile( "(?<=\\.|\\.\\s)\\p{Lower}" );
Matcher m = p.matcher( str );

while (m.find()) {
    str.setCharAt(m.end()-1, Character.toUpperCase(str.charAt(m.end()-1)) );
}

System.out.print(str);