make highlight errors go away
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@ -3866,7 +3866,7 @@ Ox.highlight <f> Highlight matches in a string
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@*/
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// fixme: with regexp, special chars would have to be escaped
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Ox.highlight = function(txt, str, classname) {
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return str.length ? txt.replace(
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return str && str.length ? txt.replace(
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new RegExp('(' + str + ')', 'ig'),
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'<span class="' + classname + '">$1</span>'
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) : txt;
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