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[英]Regex to match all occurrences between comments and inside tag only (html)
[英]match “//” comments with regex but not inside a quote
我需要匹配并替换一些评论。 例如:
$test = "the url is http://www.google.com";// comment "<-- that quote needs to be matched
我想匹配引号之外的注释,并用注释替换注释中的任何"
s "
。
我已经尝试了许多模式和不同的运行方式,但没有运气。
正则表达式将使用javascript运行以匹配php“//”注释
更新:我从下面的borkweb拿了正则表达式并修改它。 使用了http://ejohn.org/blog/search-and-dont-replace/中的一个函数,得出了这个:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script type="text/javascript">
function t_replace(data){
var q = {}, ret = "";
data.replace(/(?:((["'\/]*(("[^"]*")|('[^']*'))?[\s]*)?[\/\/|#][^"|^']*))/g, function(value){
q[key] = value;
});
for ( var key in q ){
ret = q[key];
}
var text = data.split(ret);
var out = ret + text[1];
out = out.replace(/"/g,""");
out = out.replace(/'/g,"'");
return text[0] + out;
}
</script>
</head>
<body>
<script type="text/javascript">
document.write(t_replace("$test = \"the url is http://www.google.com\";// c'o\"mment \"\"\"<-- that quote needs to be matched")+"<br>");
document.write(t_replace("$test = 'the url is http://www.google.com';# c'o\"mment \"\"\"<-- that quote needs to be matched"));
</script>
</body>
</html>
它处理单引号或双引号之外的所有行注释。 无论如何我可以优化这个功能吗?
更新2:它不处理此字符串
document.write(t_replace("$test //= \"the url is http://www.google.com\"; //c'o\"mment \"\"\"<-- that quote needs to be matched")+"<br>");
您可以使用正则表达式同时匹配所有字符串和注释。 如果它是一个字符串,您可以将其替换为自身,不更改,然后处理特殊情况以进行注释。
我想出了这个正则表达式:
"(\\[\s\S]|[^"])*"|'(\\[\s\S]|[^'])*'|(\/\/.*|\/\*[\s\S]*?\*\/)
共有3个部分:
"(\\\\[\\s\\S]|[^"])*"
用于匹配双引号字符串。 '(\\\\[\\s\\S]|[^'])*'
用于匹配单引号字符串。 (\\/\\/.*|\\/\\*[\\s\\S]*?\\*\\/)
用于匹配单行注释和多行注释。 replace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'
。
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;
});
}
测试运行:
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: $test //= "the url is http://www.google.com"; //c'o"mment """<-- that quote needs to be matched
我必须承认,这个正则表达式花了我一段时间才产生......但我很确定这会做你想要的:
<script>
var str = "$test = \"the url is http://www.google.com\";// comment \"\"\"<-- that quote needs to be matched";
var reg = /^(?:(([^"'\/]*(("[^"]*")|('[^']*'))?[\s]*)?\/\/[^"]*))"/g;
while( str !== (str = str.replace( reg, "$1"") ) );
console.log( str );
</script>
这是正则表达式中发生的事情:
^ # start with the beginning of the line
(?: # don't capture the following
(
([^"'\/]* # start the line with any character as long as it isn't a string or a comment
(
("[^"]*") # grab a double quoted string
| # OR
('[^']*') # grab a single quoted string
)? # but...we don't HAVE to match a string
[\s]* # allow for any amount of whitespace
)? # but...we don't HAVE to have any characters before the comment begins
\/\/ # match the start of a comment
[^"]* # match any number of characters that isn't a double quote
) # end un-caught grouping
) # end the non-capturing declaration
" # match your commented double quote
javascript中的while循环只是查找/替换,直到它找不到给定行中的任何其他匹配项。
不要忘记PHP注释也可以采用/* this is a comment */
的形式/* this is a comment */
可以跨越多行。
您可能会对此网站感兴趣:
http://blog.stevenlevithan.com/archives/mimic-lookbehind-javascript
Javascript在它的正则表达式引擎中没有本机lookbehind支持。 您可以做的是从一行的末尾开始并向后看以捕获半冒号后面的任何字符+可选的空格+ //所以类似于:
;\w*\/\/(.+)$
这可能无法捕捉到一切。
您还可能希望查找Javascript(或其他语言)PHP语法检查器。 我认为Komodo Edit的PHP语法检查器可能是用Javascript编写的。 如果是这样,它可能会让您深入了解如何删除所有内容,但是语法检查器需要确保PHP代码有效,注释等等。 语法颜色变换器也是如此。 以下是另外两个链接:
http://ecoder.quintalinda.com/
http://www.webdesignbooth.com/9-useful-javascript-syntax-highlighting-scripts/
在我发现非常好的@Thai答案的补充中,我想补充一点:
在此示例中,使用原始正则表达式仅匹配引号的最后一个字符: https : //regex101.com/r/CoxFvJ/2
所以我修改了一下以允许捕获完整的引号内容,并提供更健谈和通用的内容示例: https : //regex101.com/r/CoxFvJ/3
最后的正则表达式:
/"((?:\\\\"|[^"])*)"|'((?:\\\\'|[^'])*)'|(\\/\\/.*|\\/\\*[\\s\\S]*?\\*\\/)/g
非常感谢泰国解锁我。
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