JavaScript RegEx，用于从HTML标记中提取值

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/

Answer 2

Edit

If you just want to match numbers

[+-]?\d+(?:[,.]\d+)?

See it here on Regexr

Matches for an optional + or - then at least one digit, then an optional fraction with a . or a , as fraction delimiter.

/Edit

Try something like this

<font color="green">([^<]+)

You will then find the value "+4,13" in the capturing group 1.

See it here on Regexr

If you want to exclude the + than add it (maybe optional) before the capturing group

<font color="green">\+?([^<]+)