import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String[] args) {
final String regex = "^(\\d+\\.?\\d*[fF]|\\d+\\.?(?![\\p{L}_])\\d*[fF]?|\\d*\\.\\d+[fF]?)";
final String string = "10\n"
+ "50.0\n\n"
+ "42.ToString()\n"
+ "0.1.GetType()\n"
+ "9..GetHashCode()\n\n"
+ "45.1 // float\n"
+ "10f // float\n"
+ "0. // float\n"
+ "1 // int";
final Pattern pattern = Pattern.compile(regex, Pattern.UNICODE_CASE | Pattern.CASE_INSENSITIVE | Pattern.MULTILINE);
final Matcher matcher = pattern.matcher(string);
while (matcher.find()) {
System.out.println("Full match: " + matcher.group(0));
for (int i = 1; i <= matcher.groupCount(); i++) {
System.out.println("Group " + i + ": " + matcher.group(i));
}
}
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Java, please visit: https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html