I'm currently writing a parser for ColdFusion code. I'm using a regex (in c#) to extract the name datasource attribute of the cfquery tag.
我目前正在为ColdFusion代码编写一个解析器。我使用regex(在c#中)提取cfquery标记的名称datasource属性。
For the time being the regex is the following <cfquery\s.*datasource\s*=\s*(?:'|")(.*)(?:'|")
目前，regex是以下
it works well for strings like <cfquery datasource="myDS" or <cfquery datasource='myDS'
它适用于诸如
But it gets crazy when parsing strings like <cfquery datasource="#GetSourceName('myDS')#"
但是当解析像
Obviously the part of the regex (?:'|") is the cause. Is there a way to only match single quote when the first match was a single quote? And only match the double quote when the first match was a double quote?
显然，regex的部分(?:|)是原因所在。当第一场比赛是单引号时，是否只有一种方法可以匹配单引号?只有当第一场比赛是双引号时才会有双引号?
Thanks in advance!
提前谢谢!
3 个解决方案
#1
6
Edit: I think this should work in C# you just need to do a back reference:
编辑:我认为这应该在c#中有效，你只需要做一个背景参考:
datasource\s*=\s*('|")(.*)(?:\1)
or perhaps
或者
datasource\s*=\s*('|")(.*)(?:$1)
matches datasource="#GetSourceName('myDS')#" with a back reference to the first match with \1.
匹配数据源="#GetSourceName('myDS')#"，并返回第一个与\1匹配的引用。
Of course, you cannot ignore the first capture group with ?: and still have this work. Also, you may want to set the lazy flag so as not to match additional "'s
当然，您不能忽略第一个捕获组?:并且仍然有这个工作。另外，您可能想要设置lazy flag，以免与其他的“s”匹配
#2
1
I would suggest using two different regexes if possible, or splitting the regex in a different way.
如果可能的话，我建议使用两个不同的regex，或者以不同的方式拆分regex。
For a single regex, considering the question @Mike posted, ("[^"]*")|('[^']*') Then you can parse out the quotes.
一个正则表达式,考虑问题@Mike发布,(“[^]*)|(“[^]*)你就可以解析出报价。
The other potential way of doing this is by using lookahead/lookbehind, but that tends to get messy and isn't universally supported.
另一种可能的方法是使用lookahead/lookbehind，但这往往会变得很混乱，而且不会得到普遍的支持。
#3
0
Try looking at this post:
看看这篇文章:
How can I match a quote-delimited string with a regex?
如何将引用分隔的字符串与正则表达式匹配?
They seem to be dealing with the same problem.
他们似乎在处理同样的问题。
#1
6
Edit: I think this should work in C# you just need to do a back reference:
编辑:我认为这应该在c#中有效，你只需要做一个背景参考:
datasource\s*=\s*('|")(.*)(?:\1)
or perhaps
或者
datasource\s*=\s*('|")(.*)(?:$1)
matches datasource="#GetSourceName('myDS')#" with a back reference to the first match with \1.
匹配数据源="#GetSourceName('myDS')#"，并返回第一个与\1匹配的引用。
Of course, you cannot ignore the first capture group with ?: and still have this work. Also, you may want to set the lazy flag so as not to match additional "'s
当然，您不能忽略第一个捕获组?:并且仍然有这个工作。另外，您可能想要设置lazy flag，以免与其他的“s”匹配
#2
1
I would suggest using two different regexes if possible, or splitting the regex in a different way.
如果可能的话，我建议使用两个不同的regex，或者以不同的方式拆分regex。
For a single regex, considering the question @Mike posted, ("[^"]*")|('[^']*') Then you can parse out the quotes.
一个正则表达式,考虑问题@Mike发布,(“[^]*)|(“[^]*)你就可以解析出报价。
The other potential way of doing this is by using lookahead/lookbehind, but that tends to get messy and isn't universally supported.
另一种可能的方法是使用lookahead/lookbehind，但这往往会变得很混乱，而且不会得到普遍的支持。
#3
0
Try looking at this post:
看看这篇文章:
How can I match a quote-delimited string with a regex?
如何将引用分隔的字符串与正则表达式匹配?
They seem to be dealing with the same problem.
他们似乎在处理同样的问题。