Java implements regular matching "1234567" This string appears four or more times

In Java, using regular expressions to match the occurrence of a string four or more times, you can use the following steps:

• Create regular expressions: used to match strings.
• usePatternandMatcherClass: Make matches and counts.

For example, suppose we want to match the string"1234567"If it occurs four times or more than four times, we need to do the following steps:

Step 1: Create a regular expression

We can use regular expressions(?:1234567[^1234567]*){4,}Come to match"1234567"It appears four times or more, and other characters are allowed during the matching process.

Regular expression explanation:

• (?: ... ): Non-captured group, indicating a matching but not captured group.
• 1234567: The content to match the string itself.
• [^1234567]*: Matching1234567Any character other than, 0 or more times.
• {4,}: means that the previous pattern appears at least 4 times.

Step 2: Use Pattern and Matcher classes

In Java,PatternClass compiles regular expressions, throughMatcherclass to match. We will first match the entire text and then use separate logic to count.

Sample code:

package ;
import ;
import ;
public class RegexMatchExample {
    public static void main(String[] args) {
        String text = "4211234567 some text 1234567 some more text 1234567 another 1234567 more text 1234567";
        String patternString = "(?:1234567[^1234567]*){4,}";
        // Compile the pattern
        Pattern pattern = (patternString);
        // Create matcher object
        Matcher matcher = (text);
        if (()) {
            ("The string '1234567' appears four times or more.");
        } else {
            ("The string '1234567' does not appear four times or more.");
        }
        // To count exact number of occurrences
        Pattern countPattern = ("1234567");
        Matcher countMatcher = (text);
        int count = 0;
        while (()) {
            count++;
        }
        ("The string '1234567' appears " + count + " times.");
        if (count >= 4) {
            ("The string '1234567' appears four times or more.");
        } else {
            ("The string '1234567' does not appear four times or more.");
        }
    }
}

Logical explanation

Match the overall number of occurrences：

• use(patternString)Compile regular expressions.
• use()Check if there is a match.

Count exact number of occurrences：

• Compile search for specific strings separately("1234567")。
• useMatcherMatch one by one and count each match.

In this way, for a given text, it can effectively check whether the string appears four times or more, and it can also count the total number of times the string appears.

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