匹配“//”评论与正则表达式但不在报价内 [英] match "//" comments with regex but not inside a quote
问题描述
我需要匹配并替换一些评论。例如：
：
I need to match and replace some comments. for example:
$test = "the url is http://www.google.com";// comment "<-- that quote needs to be matched
我想匹配以外的评论报价，并用& quot; 替换评论中的任何。
I want to match the comments outside of the quotes, and replace any "'s in the comments with "'s.
我尝试了很多模式和不同的运行方式，但没有运气。
I have tried a number of patterns and different ways of running them but with no luck.
正则表达式将运行javascript以匹配php//评论
The regex will be run with javascript to match php "//" comments
更新：
我从下面的borkweb获取了正则表达式并对其进行了修改。使用 http://ejohn.org/blog/search-and-dont-中的函数替换/ 并提出这个：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script type="text/javascript">
function t_replace(data){
var q = {}, ret = "";
data.replace(/(?:((["'\/]*(("[^"]*")|('[^']*'))?[\s]*)?[\/\/|#][^"|^']*))/g, function(value){
q[key] = value;
});
for ( var key in q ){
ret = q[key];
}
var text = data.split(ret);
var out = ret + text[1];
out = out.replace(/"/g,""");
out = out.replace(/'/g,"'");
return text[0] + out;
}
</script>
</head>
<body>
<script type="text/javascript">
document.write(t_replace("$test = \"the url is http://www.google.com\";// c'o\"mment \"\"\"<-- that quote needs to be matched")+"<br>");
document.write(t_replace("$test = 'the url is http://www.google.com';# c'o\"mment \"\"\"<-- that quote needs to be matched"));
</script>
</body>
</html>
它处理单引号或双引号之外的所有行注释。无论如何我可以优化这个功能吗？
it handles all the line comments outside of single or double quotes. Is there anyway I could optimize this function?
更新2：
它不处理这个字符串
UPDATE 2: it does not handle this string
document.write(t_replace("$test //= \"the url is http://www.google.com\"; //c'o\"mment \"\"\"<-- that quote needs to be matched")+"<br>");
推荐答案
您可以使用正则表达式匹配所有字符串和注释同时。如果它是一个字符串，你可以用它自己替换它，保持不变，然后处理一个特殊的评论案例。
You can have a regexp to match all strings and comments at the same time. If it's a string, you can replace it with itself, unchanged, and then handle a special case for comments.
我想出了这个正则表达式：
I came up with this regex:
"(\\[\s\S]|[^"])*"|'(\\[\s\S]|[^'])*'|(\/\/.*|\/\*[\s\S]*?\*\/)
共有3个部分：
-
（\\ [\\\\ S] | [^]）*用于匹配双引号字符串。 -
'（\\ [\\\\ S] | [^']）*'用于匹配单引号字符串。 -
（\ / \ /.* | \ / \ * [\\\\ S] *？\ * \ /）用于匹配单行和多行注释。
"(\\[\s\S]|[^"])*"for matching double quoted strings.'(\\[\s\S]|[^'])*'for matching single quoted strings.(\/\/.*|\/\*[\s\S]*?\*\/)for matching both single line and multiline comments.
替换函数检查匹配的字符串是否为注释。如果不是，请不要更换。如果是，请替换和'。
The replace function check if the matched string is a comment. If it's not, don't replace. If it is, replace " and '.
function t_replace(data){
var re = /"(\\[\s\S]|[^"])*"|'(\\[\s\S]|[^'])*'|(\/\/.*|\/\*[\s\S]*?\*\/)/g;
return data.replace(re, function(all, strDouble, strSingle, comment) {
if (comment) {
return all.replace(/"/g, '"').replace(/'/g, ''');
}
return all;
});
}
试运行：
Input: $test = "the url is http://www.google.com";// c'o"mment """<-- that quote needs to be matched
Output: $test = "the url is http://www.google.com";// c'o"mment """<-- that quote needs to be matched
Input: $test = 'the url is http://www.google.com';# c'o"mment """<-- that quote needs to be matched
Output: $test = 'the url is http://www.google.com';# c'o"mment """<-- that quote needs to be matched
Input: $test //= "the url is http://www.google.com"; //c'o"mment """<-- that quote needs to be matched
Output: $test //= "the url is http://www.google.com"; //c'o"mment """<-- that quote needs to be matched
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