The code:
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Finder1 {
public static void main(String[] args) {
String exampleString = "" +
"haaa is \"${haaa}\"\n"+
"fooo is \"${fooo}\"\n";
Map<String, String> varmap = new HashMap<String, String>();
varmap.put("haaa", "HAAA");
varmap.put("fooo", "FOOO");
Pattern pattern = Pattern.compile("\\$\\{([^}]+)\\}");
// Replace once
{
Matcher m = pattern.matcher(exampleString);
StringBuffer sb = new StringBuffer(exampleString.length());
if(m.find()){
m.appendReplacement(sb, varmap.get(m.group(1)));
}
m.appendTail(sb);
System.out.println("---replaceOnce---");
System.out.println(sb.toString());
}
// Replace all
{
Matcher m = pattern.matcher(exampleString);
StringBuffer sb = new StringBuffer(exampleString.length());
while(m.find()){
m.appendReplacement(sb, varmap.get(m.group(1)));
}
m.appendTail(sb);
System.out.println("---replaceAll---");
System.out.println(sb.toString());
}
}
}
