import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String[] args) {
final String regex = "((?<![\\w.])[+-]?(?:\\d+\\.\\d+|\\d+\\.|\\.\\d+|\\d+)(?:[eE][+-]?\\d+)?(?![\\w.]))";
final String string = "a a aaaainput 1.5e8 100 1e8 1000e3 1. .2 .3e-3 -3 +3 abcd 1 192.168.100.1 1 192.168. 1 .129.12 1.5 .3ee 1 .3e+e 1 3fgh 1 .3sdf 1 asdf3 0 asdf3asdf -111.555e-100 +99.99e+99\n";
final Pattern pattern = Pattern.compile(regex);
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