Preg_match PHP to java translation

Question

I am having some trouble converting a php pregmatch to java. I thought I had it all correct but it doesn't seem to be working. Here is the code:

Original PHP:

/* Pattern for 44 Character UUID */
$pattern = "([0-9A-F\-]{44})";
if (preg_match($pattern,$content)){
                /*DO ACTION*/
            }

My Java code:

final String pattern = "([0-9A-F\\-]{44})";
    public static boolean pregMatch(String pattern, String content) {
            Pattern p = Pattern.compile(pattern);
            Matcher m = p.matcher(content);
            boolean b = m.matches();
            return b;
        }
if (pregMatch(pattern, line)) {
                        //DO ACTION
                    }

So my test input is: DBA40365-7346-4DB4-A2CF-52ECA8C64091-0

Using a series of System.outs I get that b = false.

doublesharp · Accepted Answer · 2012-10-22 14:46:47Z

8

To implement a function as you did in your code:

final String pattern = "[0-9A-F\\-]{44}";
public static boolean pregMatch(String pattern, String content) {
    return content.matches(pattern);
}

And then you can call it as:

if (pregMatch(pattern, line)) {
    //DO ACTION
}

You don't need the parenthesis in your pattern because that just creates a match group, which you are not using. If you need access to back references, you would need the parenthesis an a more advanced regex code using Pattern and Matcher classes.

edited Oct 22, 2012 at 14:46

answered Oct 22, 2012 at 14:39

doublesharp

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2 Comments

Evilsithgirl Over a year ago

I can't tell if the lines I'm trying to match is the issue or not. Some examples are: B3AF08DE-7F02-450B-A316-94AB10603956-0 ||| 83202015-E001-422C-9792-1D298893A289-0 ||| DBA40365-7346-4DB4-A2CF-52ECA8C64091-0 Is there something wrong with these lines that they fail or perhaps something else wrong in my code?

doublesharp Over a year ago

Those strings are 38 characters long, and your regex is trying to match 44 characters with {44}. Use the regex pattner [0-9A-F\\-]{38} and it will match each one of those values. If you want to match strings 38 to 44 characters long, use [0-9A-F\\-]{38,44}

xdazz · Accepted Answer · 2012-10-22 14:39:58Z

6

You could just use String.matches()

if (line.matches("[0-9A-F-]{44}")) {
  // do action
}

answered Oct 22, 2012 at 14:39

xdazz

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