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    <p>I've just submitted a patch to Rails thats solves this.</p> <p><a href="http://rails.lighthouseapp.com/projects/8994-ruby-on-rails/tickets/3593-patch-support-for-highlighting-with-ignoring-special-chars" rel="nofollow noreferrer">http://rails.lighthouseapp.com/projects/8994-ruby-on-rails/tickets/3593-patch-support-for-highlighting-with-ignoring-special-chars</a></p> <pre><code> # Highlights one or more +phrases+ everywhere in +text+ by inserting it into # a &lt;tt&gt;:highlighter&lt;/tt&gt; string. The highlighter can be specialized by passing &lt;tt&gt;:highlighter&lt;/tt&gt; # as a single-quoted string with \1 where the phrase is to be inserted (defaults to # '&lt;strong class="highlight"&gt;\1&lt;/strong&gt;') # # ==== Examples # highlight('You searched for: rails', 'rails') # # =&gt; You searched for: &lt;strong class="highlight"&gt;rails&lt;/strong&gt; # # highlight('You searched for: ruby, rails, dhh', 'actionpack') # # =&gt; You searched for: ruby, rails, dhh # # highlight('You searched for: rails', ['for', 'rails'], :highlighter =&gt; '&lt;em&gt;\1&lt;/em&gt;') # # =&gt; You searched &lt;em&gt;for&lt;/em&gt;: &lt;em&gt;rails&lt;/em&gt; # # highlight('You searched for: rails', 'rails', :highlighter =&gt; '&lt;a href="search?q=\1"&gt;\1&lt;/a&gt;') # # =&gt; You searched for: &lt;a href="search?q=rails"&gt;rails&lt;/a&gt; # # highlight('Šumné dievčatá', ['šumňe', 'dievca'], :ignore_special_chars =&gt; true) # # =&gt; &lt;strong class="highlight"&gt;Šumné&lt;/strong&gt; &lt;strong class="highlight"&gt;dievča&lt;/strong&gt;tá # # You can still use &lt;tt&gt;highlight&lt;/tt&gt; with the old API that accepts the # +highlighter+ as its optional third parameter: # highlight('You searched for: rails', 'rails', '&lt;a href="search?q=\1"&gt;\1&lt;/a&gt;') # =&gt; You searched for: &lt;a href="search?q=rails"&gt;rails&lt;/a&gt; def highlight(text, phrases, *args) options = args.extract_options! unless args.empty? options[:highlighter] = args[0] || '&lt;strong class="highlight"&gt;\1&lt;/strong&gt;' end options.reverse_merge!(:highlighter =&gt; '&lt;strong class="highlight"&gt;\1&lt;/strong&gt;') if text.blank? || phrases.blank? text else haystack = text.clone match = Array(phrases).map { |p| Regexp.escape(p) }.join('|') if options[:ignore_special_chars] haystack = haystack.mb_chars.normalize(:kd) match = match.mb_chars.normalize(:kd).gsub(/[^\x00-\x7F]+/n, '').gsub(/\w/, '\0[^\x00-\x7F]*') end highlighted = haystack.gsub(/(#{match})(?!(?:[^&lt;]*?)(?:["'])[^&lt;&gt;]*&gt;)/i, options[:highlighter]) highlighted = highlighted.mb_chars.normalize(:kc) if options[:ignore_special_chars] highlighted end end </code></pre>
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