Regex get only numeric values from string

Question

I want to get 116.83 and 81.16 from the below string. I tried \d but it also selects 2 from up2 and dn2. How can i ignore this.

<td align="right">
    116.83<span class="up2"></span><br>81.16<span class="dn2"></span>
</td>

What characters are allowed to come before and after the number? — Barmar
– Barmar, Commented Apr 6, 2013 at 6:44
if you want to parse HTML, don't use regular expressions, use a DOM parser. — Barmar
– Barmar, Commented Apr 6, 2013 at 6:45
In the javascript DOM API, that is nodes = [].filter.call(elem.childNodes, function(x){return x.nodeType==3}) — John Dvorak
– John Dvorak, Commented Apr 6, 2013 at 6:50

Barmar · Accepted Answer · 2013-04-06 07:02:53Z

5

\b[\d.]+\b

\b matches the boundary between word and non-word characters, but doesn't include the adjacent characters in the match. Since letters and numbers are both word characters, it won't match between p and 2, so up2 doesn't match. But > is a non-word character, so it matches between > and 8, therefore the regexp matches 81.16.

answered Apr 6, 2013 at 7:02

Barmar

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4 Comments

Santosh Over a year ago

Its what i wanted. Thanks you very much. Can you also explain. I have accepted/voted your answer.

Barmar Over a year ago

I did explain. What part don't you understand?

Aiias Over a year ago

@Barmar - Did you mean to escape the period? \b[\d\.]+\b

Barmar Over a year ago

@Aiias No, period has no special meaning inside [], so it doesn't need to be escaped.

Aiias · Accepted Answer · 2013-04-06 06:53:28Z

1

Try something like this:

[>\s]+([\d\.]+)[<\s]+

But be sure to strip the leading > and whitespace as well as the trailing < and whitespace from the first level match OR take the second level matches only.

answered Apr 6, 2013 at 6:53

Aiias

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1 Comment

Barmar Over a year ago

You should be using the value from capture group 1, which gets what's in the parentheses.

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