Question:
I got some html text, which contains all kinds of html tags, such as <table>, <a>, <img>, and so on.
Now I want to use a regular expression to remove all the html tags, except <img ...> and </img>(and upper case <IMG></IMG>).
How to do this?
UPDATE:
My task is very simple, it just print the text content(including images) of a html as a summary in the front page, so I think regular expression is good and simple enough.
UPDATE AGAIN
Maybe a sample will make my question better to understand :)
There are some html text:
<html> <head></head> <body> Hello, everyone. Here is my photo: <img src="xxx.jpg" />. And, <a href="xxx">know more</a> about me! </body> </html> I want to keep , and remove other tags. Following is what I want:
Hello, everyone. Here is my photo: <img src="xxx.jpg" />. And, know more about me! Now I code like this:
html.replaceAll("<.*?>", "") But it will remove all the content between < and >, but I want to keep <img xxx> and </img>, and remove the other content between < and >
Thank for everyone!
Solution:1
I tried a lot, this regular expression seems work for me:
(?i)<(?!img|/img).*?> My code is:
html.replaceAll('(?i)<(?!img|/img).*?>', '');
Solution:2
Do not use a RegEx to parse HTML. See here for a compelling demonstration of why.
Use an HTML parser for your language/platform.
- Here is a java one (HTML parser)
- For .NET, the HTML Agility Pack is recommended
- For ruby, there is nokogiry, though I am not a ruby dev, so don't know how good it is
Solution:3
A simple answer to why Do not use a RegEx is:
Regexp can't parse recursive grammar such as:
S -> (S) S -> Empty Because this kind of grammar has infinite state.
Since HTML has a recursive grammar you can simply use regexp.
SPAN -> <span>SPAN</span> SPAN -> text But in your case you can express a regular expression that is not recursive.
Solution:4
<(img|IMG)*>*</(img|IMG)> Note:If u also have question or solution just comment us below or mail us on toontricks1994@gmail.com
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