Java-Coding-Problems/Chapter01/P16_CheckStringContainsSubstring/src/modern/challenge/Strings.java at master · D-Coder135/Java-Coding-Problems · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
package modern.challenge;

import java.util.regex.Pattern;

public final class Strings {

    private Strings() {
        throw new AssertionError("Cannot be instantiated");
    }

    public static boolean containsV1(String text, String subtext) {

        if (text == null || subtext == null
                || text.isBlank() || subtext.isBlank()) {
            // or throw IllegalArgumentException
            return false;
        }

        return text.matches("(?i).*" + Pattern.quote(subtext) + ".*");
    }

    public static boolean containsV2(String text, String subtext) {

        if (text == null || subtext == null
                || text.isBlank() || subtext.isBlank()) {
            // or throw IllegalArgumentException
            return false;
        }

        return text.indexOf(subtext) != -1; // or lastIndexOf()
    }
}