Possible Duplicate:
Regex to match URL
Is there a regular expression to return a http value from a string?
So
sdfads saf as fa http://www.google.com some more text
becomes
http://www.google.com
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2 Answers
a very simple approach:
https?://\S+
if you must check for valid urls the regex is much more complex
Comments
Here is simple and working example that contains retrieving searched pattern and using it to replace whole input:
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Regextest {
static String[] matchThese = new String[] {
"sdfads saf as fa http://www.google.com some more text",
"sdfads fa http://www.dupa.com some more text",
"should not match http://" };
public static void main(String[] args) {
String regex = "(https?://|www)\\S+";
Pattern p = Pattern.compile(regex);
System.out.println("Those that match are replaced:");
for (String input : matchThese) {
if (p.matcher(input).find()) {
Matcher matcher = p.matcher(input);
matcher.find();
// Retrieve matching string
String match = matcher.group();
String output = input.replace(input, match);
System.out.println(output);
}
}
}
}
