CODEWITHSUNDEEP
javastringpattern-matching
Hawk
Hawk

Reputation: 5170

How to match specific part of the URI string based on the following characters / words

I am trying to match particular part of the URI only when it is not followed by anything, or when it followed by '?'. 

.../survey?expand=all  //should match    
.../survey             //should match   
.../survey/..          //should not match

I could not find a way to do that in one pattern. I tried (?=.*survey(?!\\?)) and did not work. I also could not find a way to do it in two separate patterns. For example, I want to match .../survey and not .../survey/... but this .*?/survey\\b did not work for me.

My parser:

public class UriParser {

    private static String reqUriPath = null;
    private static String pattern = null;


    public static Boolean isURIMatching(Object routePattern, String pattern){
        reqUriPath = routePattern.toString();
        return checkPattern(reqUriPath, pattern);
    }


    private static Boolean checkPattern(String reqUriPath, String pattern) {
        Pattern p = Pattern.compile(pattern,Pattern.CASE_INSENSITIVE);
        Matcher m = p.matcher(reqUriPath);
        return m.find();
    }

}

Upvotes: 0

Views: 765

Answers (2)

Amit Kumar Lal
Amit Kumar Lal

Reputation: 5789

I have updated my regex with better answer 

\\/survey(?(?=\\?)\\S*|$)

Explanation:

Here (?(?=\\?)\\S*|$) is basically an If clause i.e. (?=\\?) --> if(contains ?) else |$ so we have following condition :-
1. ?=<condition> i.e. \\? --> ? i.e. literal ? , so if ? is found in the String then allow \S* any nonwhite space.
2. | is Else condition i.e. else the string must end there, hence no chance of matching / any further.


If you feel confused with the explanation you can check out below link for regex 101 which has a coll explanation about the regex with all the description
https://regex101.com/r/WCt3WB/2

Upvotes: 1

Chathura Buddhika
Chathura Buddhika

Reputation: 2195

I am trying to match particular part of the URI only when it is not followed by anything, or when it followed by '?'.

You can do this without Regex;

public class UriParser {

     public static void main(String []args){
        System.out.println(isURIMatching("http://test.com/survey?expand=all", "survey"));
        System.out.println(isURIMatching("http://test.com/survey", "survey"));
        System.out.println(isURIMatching("http://test.com/survey/anything", "survey"));
     }

    public static Boolean isURIMatching(Object routePattern, String pattern){
        final String reqUriPath = routePattern.toString();
        final int lastIndex = reqUriPath.lastIndexOf(pattern);
        final String lastPart = reqUriPath.substring(lastIndex+pattern.length()).trim();
        return "".equals(lastPart) || lastPart.startsWith("?");
    }
}

Upvotes: 0

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