Hi ,
I have a variable that saves the whole line doctype of a page using regular expression

I'm, not sure what the connection between using string replace functions and asking for a regex are but I'll let that slide. Also, I'm not sure what the rules are as to how 'doctype' tags are formatted and what variability there is in identifying the text you want to extract, but based on your pattern, I would suggest:

<!doctype.*?//dtd\s+([^/]*)//EN.*?dtd">

and look at match group #1 for the matched text. I'm using the same options as you have in your posting.

You might be able to cut down the pattern if, for example, the text you are looking for only appears between the "//dtd' and '//en' strings and this is known not to appear elsewhere in the text, or you might want to leave in the first or last parts of my suggestion.

Susan

I am sorry Susan I don't understand .

Could you make it more clearly ?

Thanks a lot! 

OK, I think I finally understand what you are trying to do.  You question wasn't very clear. In the future please try to follow the posting guidelines as much as possible.  I don't know the purpose of you application so I don't know why you can't just match the string 'SVG Basic 1.1'. Even if must match if with the DTD declaration, You can just match it with as a second regex. with the results of your first.  I don't know PHP so I don't know if the code is correct

$res2 = str_replace("(.*)//DTD","", $res1);
$res = str_replace("(^//EN) .* (dtd\")$","", $res2);

$res = preg_match('/SVG 1.1 Basic/is',$res1);

The doctype is not constant.

That is the reason why I would like a regular expression.

I am trying

 But :

 Warning: preg_match() expects parameter 2 to be string, array given in my_file.php

Thank you for replying!