## 問題 Problem 你想把字符串的一部分替換為其他的值。 You need to replace a portion of a string with another value. ## 方法 Solution 使用JavaScript的`replace`方法。`replace`掉給定字符串中的匹配，返回修改后的字符串。 Use the JavaScript?`replace`?method.?`replace`?matches with the given string, and returns the edited string. 第一種形式，接受兩個參數：_模式_ 和?_替換為的字符串_ The first version takes 2 arguments:?_pattern_?and?_string replacement_ ~~~ "JavaScript is my favorite!".replace /Java/, "Coffee" # => 'CoffeeScript is my favorite!' "foo bar baz".replace /ba./, "foo" # => 'foo foo baz' "foo bar baz".replace /ba./g, "foo" # => 'foo foo foo' ~~~ 第二種形式，也是接受兩個參數：_模式_ 和?_回調函數_ The second version takes 2 arguments:?_pattern_?and?_callback function_ ~~~ "CoffeeScript is my favorite!".replace /(\w+)/g, (match) -> match.toUpperCase() # => 'COFFEESCRIPT IS MY FAVORITE!' ~~~ 每個匹配都會調用回調函數，并把匹配值作為參數傳遞給它。 The callback function is invoked for each match, and the match value is passed as the argument to the callback. ## 討論 Discussion 正則表示式是一種強大的匹配和替換字符串的方式。 Regular Expressions are a powerful way to match and replace strings.