如何查找与正则表达式不匹配的所有内容 [英] How to find everything that is not matching a regular expression
问题描述
我想搜索成千上万的HTML代码,以了解高度,宽度或任何其他CSS的不良习惯。
例如,我想获得所有地方其中height不提供单位,例如 height:40
应该被找到,但 height:40px
。
因为我使用的是搜索程序代理ransack,我可以把正则表达式在文件中搜索。
目前我的正则表达式是:
(height:)[\ s] * [0-9] \。?[0-9] +(px)
c $ c> height:40px 。 (以后我想添加宽度或其他东西)
我的问题是如何使一个不是最好的?
使用负前瞻功能(?! regex)
,例如:
height:\s * \d +(?: \.\d +)?(?! px | \d)
需要
\d
才能防止回溯替代品匹配。
I would like to search all over thousands of HTML code for bad practice of height, width or any other CSS.
for instance I would like to get all places where height is not provided with units, for instance height:40
should be found, but height:40px
shouldn't.
For that I am using the search program agent ransack, in which I can put regular expression to search within files.
Currently my regular expression is:
(height:)[\s]*[0-9]*\.?[0-9]+(px)
this finds everything that is like height:40px
. (Later on I want to add width, or other things)
My question is how to make a NOT on top of all that?
Or is there any other good application to search files for regular expressions?
Use a negative lookahead (?!regex)
, eg:
height:\s*\d+(?:\.\d+)?(?!px|\d)
\d
is needed to prevent backtracking alternatives from matching.
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