import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String[] args) {
final String regex = "(?<ip>\\d+\\.\\d+\\.\\d+\\.\\d+)[\\s-]+(?<date>\\[.*\\])[\\s\"]+(?<method>\\w+)\\s+(?<url>[^\\s]+)\\s+(?<protocol>[^\\s]+)[\\s\"]+(?<status>\\d+)\\s+(?<length>\\d+)([ -]+(?<useragent>.*))?";
final String string = "207.46.13.93 - - [31/Mar/2012:19:43:19 +0530] GET /robots.txt HTTP/1.1 404 613 - Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)\n"
+ "202.164.138.60 - - [31/Mar/2012:20:20:10 +0530] GET /kuhsonline/ HTTP/1.1 302 80 http://www.google.co.in/url?sa=t&rct=j&q=www.kuhas.ac.in&source=web&cd=2&sqi=2&ved=0CCwQFjAB&url=http%3A%2F%2Fwww.kuhas.ac.in%2Fkuhsonline%2F&ei=mRl3T-XtMofVrQfJiYWqDQ&usg=AFQjCNF4mlbbtGFCu495PHK2BTGwO4Ol0w Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0)\n";
final Pattern pattern = Pattern.compile(regex, 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