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    <p>This is a very long and convoluted regular expression that fits all your requirements. It will work if your regex engine is based on PCRE (hopefully you're using PHP, Delphi or R..).</p> <pre><code>(?&lt;=[^\d,.]|^)\d{1,3}(,(\d{3}))*((?=[,.](\s|$))|(\.\d+)?(?=[^\d,.]|$)) </code></pre> <p><a href="http://regexr.com?37at5" rel="nofollow">DEMO on RegExr</a></p> <p>The things that make it so long:</p> <ol> <li>Matching multiple numbers on the same line separated by only 1 character (a space) whilst not allowing partial matchs requires a lookahead and a lookbehind.</li> <li>Matching numbers ending with <code>.</code> and <code>,</code> without including the <code>.</code> or <code>,</code> in the match requires another lookahead.</li> </ol> <p><code>(?=[,.](\s|$))</code> <strong>Explanation</strong></p> <p>When writing this explanation I realised the <code>\s</code> needs to be a <code>(\s|$)</code> to match <code>1,</code> at the very end of a string.</p> <p>This part of the regex is for matching the <code>1</code> in <code>1,</code> or the <code>1,000</code> in <code>1,000.</code> so let's say our number is <code>1,000.</code> (with the <code>.</code> on the end).</p> <p>Up to this point the regex has matched <code>1,000</code>, then it can't find another <code>,</code> to repeat the thousands group so it moves on to our <code>(?=[,.](\s|$))</code></p> <p><code>(?=....)</code> means its a lookahead, that means from where we have matched up to, look at whats coming but don't add it to the match.</p> <p>So It checks if there is a <code>,</code> or a <code>.</code> and if there is, it checks that it's immediately followed by whitespace or the end of input. In this case it is, so it'd leave the match as <code>1,000</code></p> <p>Had the lookahead not matched, it would have moved on to trying to match decimal places.</p>
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    1. COSo far it seems to work great. I'll test it a bit more. Thanks a lot! Can u please explain : (?=[,.]\s) ?
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    2. COAh great, I'll add that explanation to the answer.
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    3. COAnswer updated - I had to make a slight change to the regex too to allow for an edge case.
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