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Editorial Team
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Asked: 2026-06-07T23:57:00+00:00

NSString* attribute_list = [wvPage stringByEvaluatingJavaScriptFromString: @var attrs=document.getElementsByClassName(‘attributes-list’)[0].innerHTML;attrs = attrs.replace(/(?:<\!\-\-[^\-]*\-\->|<li[^>]*>|&nbsp;|\ )/ig, ”);attrs = attrs.replace(/<\/li[^>]*>/ig, ‘|’);];

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    NSString* attribute_list = [wvPage stringByEvaluatingJavaScriptFromString:
            @"var attrs=document.getElementsByClassName('attributes-list')[0].innerHTML;attrs = attrs.replace(/(?:<\!\-\-[^\-]*\-\->|<li[^>]*>|&nbsp;|\ )/ig, '');attrs = attrs.replace(/<\/li[^>]*>/ig, '|');"];

Above is my code. I want to do replace in JavaScript.

Things work fine, but I’m getting warnings. How can I ban these warnings?

Unknown escape sequence '\!'
Unknown escape sequence '\-'
...

and things like this.

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1 Answer

  1. Editorial Team

    You are using a string @"" which allows special escaped characters (e.g. think of how \n magically becomes a new-line). This means every backslash in your code that is not meant to be parsed in this way must be doubled so that it is kept verbatim.

    For example:

    @"var attrs=document.getElementsByClassName('attributes-list')[0].innerHTML;attrs = attrs.replace(/(?:<\\!\\-\\-[^\\-]*\\-\\->|<li[^>]*>|&nbsp;|\\ )/ig, '');attrs = attrs.replace(/<\\/li[^>]*>/ig, '|');"];
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