How to check if a string contains certains letters/characters

Question

If I want to check whether a String contains "CVR", "CPR" and "NR". How do I do so? I tried with following method but got some issues

String testString = "cpr1210";

if (testString.contains("cpr||cvr||nr")) {
    System.out.println("yes");
}

See https://docs.oracle.com/javase/7/docs/api/java/lang/String.html#contains(java.lang.CharSequence) — maloomeister, Jun 23 '20 at 10:45
1. You should mention what your issue is. 2. This is not a valid Java syntax. 3. Use `String.contains()` instead. — Amongalen, Jun 23 '20 at 10:47
@Amongalen I tried with contains() but it does not detect the sequence of characters. — JokesOnYou, Jun 23 '20 at 10:48
"cor1210" - doesn't contain any of the mentioned test sequences. Don't know what you expected. — Amongalen, Jun 23 '20 at 10:50
@Amongalen What I meant is that even if I was to write a string with the letters, it still wont detect — JokesOnYou, Jun 23 '20 at 10:51

score 1 · Accepted Answer · answered Jun 23 '20 at 10:50

I might use String#matches() here, with a regex alternation:

String input = "cpr1210";
if (input.matches("(?i).*(?:cpr|cvr|nr).*")) {
    System.out.println("MATCH");
}

If you really wanted to use String#contains(), then you would need to have three separate calls to that method, for each sequence.

maloomeister · Answer 2 · 2020-06-23T10:57:38.017

0

As mentioned in my comment to your question, you may use String#contains().

    String testString = "cor1210";
    // will not print yes, because none of the sequences fit
    if (testString.contains("cpr") || testString.contains("cvr") || testString.contains("nr")) {
        System.out.println("yes");
    }

Make sure your logic-syntax in the if-clause is correct.

edited Jun 23 '20 at 10:57

answered Jun 23 '20 at 10:50

maloomeister

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score 0 · Answer 3 · answered Jun 23 '20 at 11:03

You can check whether a String contains another String (a substring) with the String.contains() method. It returns a boolean value. Keep in mind that this method is case sensitive. If you want to do case-insensitive search then use the same technique, convert both input and search string in same case and then call the method.

    String testString = "cor1210";

    //checks whether testString contains CVR, CPR or NR
    if (testString.contains("CVR")||testString.contains("CPR")||testString.contains("NR")){
        System.out.println("yes");
    }

How to check if a string contains certains letters/characters

3 Answers3