javascript - js中基于正则表达式的替换

Question

实际上我想替换一个字符串，除非它出现在圆括号中。

例如:

JAVA is a nice language. (JAVA) has lots of features. JAVA is portable. (JAVA) even comes in 64 bit.

现在如果我用 C 替换 JAVA:

然后期望的输出是:

C is a nice language. (JAVA) has lots of features. C is portable. (JAVA) even comes in 64 bit. 

甚至java也可以作为子字符串出现

 XJAVAX is a nice language. (XJAVAX) has lots of features. JAVA is portable. (JAVA) even comes in 64 bit.

现在，如果我用 C 替换 JAVA:

然后预期的输出:

XCX is a nice language. (XJAVAX) has lots of features. C is portable. (JAVA) even comes in 64 bit.

Answer 1

由于 JavaScript 没有后视，最简单的方法可能是交替:

str = str.replace(/\(JAVA\)|JAVA/g, function(m) {
    return m === "(JAVA)" ? m : "C";
    // Or
    // return m.length === 6 ? m : "C";
});

除此之外，您开始尝试 simulate look-behind ，这在某些方面是可能的，但很麻烦。