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I know that a parser would best be suited for this situation but in my current situation it has to be just straight javascript.
I have a regex to find the closing body tag of an html doc.
var closing_body_tag = /(<\/body>)/i;
However, this fails when source has more than 1 body tag set. So I was thinking about going with something like this..
var last_closing_body_tag = /(<\/body>)$/gmi;
This works for the case when multiple tags are found, but for some reason it is failing on cases with just 1 set of tags.
Am I making a mistake that would cause mixed results for single tag cases?
Yes, I understand more than one body tag is incorrect, however, we have to handle all bad source.
904
You can use this regex:
/<\/body>(?![\s\S]*<\/body>[\s\S]*$)/i
(?![\s\S]*<\/body>[\s\S]*$) is a lookahead that ensures there is no more closing body tag before the end of the string.
Here is a demo.
Sample code for adding a tag:
var re = /<\/body>(?![\s\S]*<\/body>[\s\S]*$)/i;
var str = '<html>\n<body>\n</body>\n</html>\n<html>\n<body>\n</body>\n</html>';
var subst = '<tag/>';
var result = str.replace(re, subst);
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