Question

爵士我正在用javascript做一个项目。我想用regex.in替换一个段落的文本我想用javascript替换一些单词

例如：

 var str =" Would you like to have responses to your questions |code Would you like to have responses to your questions code| Would you like to have responses to your questions  "

 var n=str.replace("to","2");

此处所有“到”都会被替换。我们不想删除 | code 到代码| 请帮帮我任何人......

Answer 1

我认为你不应该依赖regexp来完成这些任务，因为它会过于复杂，因此很慢。无论如何，如果你的表达是正确的（即每个"|code"有一个"code|"并且没有嵌套的code标签），你可以试试这个：

var n = str.replace(/to(?!(?:\|(?!code)|[^\|])*code\|)/g, "2");

不仅复杂，而且很难维护。在这些情况下，最好的做法是将字符串拆分为块：

var chunks = [], i, p = 0, q = 0;
while ((p = str.indexOf("|code", p)) !== -1) {
    if (q < p) chunks.push(str.substring(q, p));
    q = str.indexOf("code|", p);
    chunks.push(str.substring(p, p = q = q + 5));
}
if (q < str.length) chunks.push(str.substring(q));

// chunks === [" Would you like to have responses to your questions ",
//             "|code Would you like to have responses to your questions code|",
//             " Would you like to have responses to your questions  "]

注意：str.replace("to", "2") 不会替换"to"的每一次出现，而只替换第一次出现。

Answer 2

如果你想将所有'to'替换成2，那将是代码

var str =" Would you like to have responses to your questions |code Would you like to have responses to your questions code| Would you like to have responses to your questions";
var n=str.replace(/to/g,"2");

用于替换文本的Javascript和正则表达式

2 个答案: