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let text = "Hello, my number is 123-456-7890.";

let pattern = /(\d{3})-(\d{3})-(\d{4})/;

let replacedText = text.replace(pattern, "Phone: $1-$2-$3");

console.log(replacedText);

// 输出: Hello, my number is Phone: 123-456-7890.

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let fullName = "Doe, John";

let namePattern = /(\w+),\s+(\w+)/;

let reversedName = fullName.replace(namePattern, "$2 $1");

console.log(reversedName);

// 输出: John Doe

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let content = "This is a sample text with some keywords.";

let keywordPattern = /(keywords)/i;

let highlightedContent = content.replace(keywordPattern, "<strong>$1</strong>");

console.log(highlightedContent);

// 输出: This is a sample text with some <strong>keywords</strong>.