Question

<font color="green">+4,13</font>% 

I know that I shouldn’t use regular expressions for that, but that’s a single case where my only html is that so…

how can I get “4,13” from the string above?

EDIT

Context:

I am sorting a table via jQuery TableSorter. A column contains that html-formatted data and I can’t change it. The custom parser I’m writing has a format function, which I currently use for managing currency, percentages and so on…

Now, I want to check, with a regex, if the string that comes to me is a string.

format: function(s) {
    console.log(s);
    var stripped = s.replace("<font>","")
                     .replace("</font>", "");
    return jQuery.tablesorter.formatFloat(stripped);
}

Answer 1

This should work for your specific example –

var tagtext = '<font color="green">+0.00</font>%';
var keepplusorminus = false;
var myregexp = keepplusorminus ? /[-\+,\.0-9]+/ : /[,\.0-9]+/;
var match = myregexp.exec(tagtext);
if (match != null) {
    result = match[0];
} else {
    result = "";
}
alert(result);

Working demo – http://jsfiddle.net/ipr101/LHBp7/