How to find some words in a HTML page

Question

I have a problem with this code:

textRange = [[html lowercaseString] rangeOfString:[substring lowercaseString]];

I'd like to find some words (substrings) in a HTML page. Using this method, I can find the words that are defined in "substring" but I want to find only entire words which are the substring to be searched for, and not any arbitrary (unbounded) occurrences of the substring. So I tried this method but nothing has changed:

textRange = [html rangeOfString:substring options:NSLiteralSearch];

Here's the entire code:

NSRange textRange;
textRange = [[html lowercaseString] rangeOfString:[substring lowercaseString]];
if (textRange.location != NSNotFound) {
    check++;
} else {
    // webView.hidden = NO;
}

Answer 1

使用NSRegularExpression并在模式的开头和结尾包含\\b以匹配单词边界。