String input = "Thanks, thanks very much";
String regex = "([Tt])hanks";
Pattern pattern = Pattern.compile (regex);
Matcher matcher = pattern.matcher (input);
StringBuffer sb = new StringBuffer();
// loop while matches are encountered
while (matcher.find()) {
if (matcher.group(1).equals ("T")) {
matcher.appendReplacement (sb, "Thank you");
} else {
matcher.appendReplacement (sb, "thank you");
}
}
// complete the transfer to the StringBuffer
matcher.appendTail (sb);
// print the result
System.out.println (sb.toString());
// Let's try that again, using the $n escape in the replacement
sb.setLength (0);
matcher.reset();
String replacement = "$1hank you";
// loop while matches are encountered
while (matcher.find()) {
matcher.appendReplacement (sb, replacement);
}
// complete the transfer to the StringBuffer
matcher.appendTail (sb);
// print the result
System.out.println (sb.toString());
// And once more, the easy way (because this example is simple)
System.out.println (matcher.replaceAll (replacement));
// One last time, using only the String
System.out.println (input.replaceAll (regex, replacement));
