计算行尾的出现次数

计算行尾出现次数是一个常见的编程任务，通常可以使用编程语言中的字符串操作或正则表达式来实现。以下是一些常见编程语言的示例代码：

Python

text = "This is a sample text with multiple lines.\nThis is the second line.\nThis is the third line."
count = text.count('\n')
print(f"The text contains {count} line breaks.")

Java

String text = "This is a sample text with multiple lines.\nThis is the second line.\nThis is the third line.";
int count = 0;
for (int i = 0; i< text.length(); i++) {
    if (text.charAt(i) == '\n') {
        count++;
    }
}
System.out.println("The text contains " + count + " line breaks.");

JavaScript

const text = "This is a sample text with multiple lines.\nThis is the second line.\nThis is the third line.";
const count = (text.match(/\n/g) || []).length;
console.log(`The text contains ${count} line breaks.`);

string text = "This is a sample text with multiple lines.\nThis is the second line.\nThis is the third line.";
int count = text.Count(c => c == '\n');
Console.WriteLine($"The text contains {count} line breaks.");

$text = "This is a sample text with multiple lines.\nThis is the second line.\nThis is the third line.";
$count = substr_count($text, "\n");
echo "The text contains $count line breaks.";

在这些示例中，我们使用了不同编程语言的字符串操作和正则表达式来计算文本中行尾的出现次数。这些示例可以作为参考，帮助您更好地理解如何在不同编程语言中实现这个功能。