仅当单词前面没有特定字符时才替换它

Question

I like to replace all occurrences of a string in JavaScript where the string does not start with < or / .我喜欢替换 JavaScript 中字符串不以<或/开头的所有字符串。 I was able to match the word but I want to replace the word only, not the preceding characters.我能够匹配这个词，但我只想替换这个词，而不是前面的字符。

var hitName1 = "body";

var testHtmlStr = "This is a test string with <body> html tag and with regular body string and another <body> html string and with no flexbody and with /body as in a url string";

var re5 = new RegExp('[^<\/]' + hitName1 , 'gi');

console.log(re5);

var testResult5 = testHtmlStr.match(re5);

console.log(testResult5);

I get the result [" body", "xbody"]我得到结果[" body", "xbody"]

If I use replace() instead of match() I will replace " body" and "xbody" with replace string.如果我使用replace()而不是match() ，我将用替换字符串替换“body”和“xbody”。 But I would like to replace only "body" with replace string.但我只想用替换字符串替换“body”。 How to do that?怎么做？

More explanation:更多解释：

use of replace:使用替换：

var testResult5 = testHtmlStr.replace(re5, "HELLO");

console.log(testResult5);

The resulting string after replacement:替换后的结果字符串：

"This is a test string with <body> html tag and with regularHELLO string and another <body> html string and with no fleHELLO and with /body as in a url string"

The replace function replaced body with HELLO , but I want to replace body (with nospace infront).替换 function 用HELLO替换了body ，但我想替换body （前面没有空格）。 Also the xbody replaced with HELLO , but I want to replace only body not xbody .也将xbody替换为HELLO ，但我只想替换body而不是xbody 。

Hope this is more clear.希望这更清楚。

Answer 1

One way you could do it is defining a capturing group around the preceding character:一种方法是围绕前面的字符定义一个捕获组：

var hitName1='body';
var testHtmlStr = "This is a test string with <body> html tag and with regular body string and another <body> html string and with no flexbody and with /body as in a url string";
var re5 = new RegExp('([^<\/]|^)' + hitName1, 'gi');

alert(testHtmlStr.replace(re5, '$1'));

jsFiddle Demo jsFiddle 演示

So if you want to replace your string with fos for example, you can write $1fos .因此，如果你想用fos替换你的字符串，你可以写$1fos 。

UPDATE : Following @yankee's comment I've changed the regex: added |^ to make it work when testHtmlStr starts with hitName1 or is equal to it.更新：在@yankee 的评论之后，我更改了正则表达式：添加|^以使其在testHtmlStr以hitName1或等于它时工作。

Answer 2

well i couldn't understand what you want to do exactly but i think you are trying to replace some tags from a string that contains tags and other textNodes好吧，我不明白您到底想做什么，但我认为您正在尝试从包含标签和其他 textNodes 的字符串中替换一些标签

However, i think if you use "for" loop to verify which tags should be replace and which tags shouldn't, you will be able to do what you need.但是，我认为如果您使用“for”循环来验证应该替换哪些标签以及不应该替换哪些标签，您将能够做您需要的事情。

for(result in testResult5)
{
    if(result!="body") {// do what you want}
}

仅当单词前面没有特定字符时才替换它

问题描述

2 个解决方案

解决方案1
3 2011-07-11 08:49:34

解决方案2
0

仅当单词前面没有特定字符时才替换它

问题描述

2 个解决方案

解决方案1 3 2011-07-11 08:49:34

解决方案2 0

解决方案1
3 2011-07-11 08:49:34

解决方案2
0