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  1. PO
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    <p>If you want to do it with regex, how about this?</p> <pre><code>(?&lt;=^|,)("[^"]*"|[^,]*)(?=,|$) </code></pre> <p>This matches comma-separated fields, including the possibility of commas appearing inside quoted strings like <code>123,"Yes, No"</code>. <a href="http://regexr.com?30q34" rel="nofollow noreferrer">Regexr for this.</a></p> <p>More verbosely:</p> <pre><code>(?&lt;=^|,) # Must be preceded by start-of-line or comma ( "[^"]*"| # A quote, followed by a bunch of non-quotes, followed by quote, OR [^,]* # OR anything until the next comma ) (?=,|$) # Must end with comma or end-of-line </code></pre> <p>Usage would be with something like Python's <code>re.findall()</code>, which returns all non-overlapping matches in the string (working from left to right, if that matters.) Don't use it with your equivalent of <code>re.search()</code> or <code>re.match()</code> which only return the first match found.</p> <p>(NOTE: This actually doesn't work in Python because the lookbehind <code>(?&lt;=^|,)</code> isn't fixed width. Grr. Open to suggestions on this one.)</p> <hr> <p>Edit: Use a non-capturing group to consume start-of-line or comma, instead of a lookbehind, and it works in Python.</p> <pre><code>&gt;&gt;&gt; test_str = '123,456,"String","String, with, commas","Zero-width fields next",,"",nyet,123' &gt;&gt;&gt; m = re.findall('(?:^|,)("[^"]*"|[^,]*)(?=,|$)',test_str) &gt;&gt;&gt; m ['123', '456', '"String"', '"String, with, commas"', '"Zero-width fields next"', '', '""', 'nyet', '123'] </code></pre> <hr> <p>Edit 2: The <a href="https://stackoverflow.com/questions/80357/ruby-match-all-occurrences-of-a-regex">Ruby equivalent</a> of Python's <code>re.findall(needle, haystack)</code> is <code>haystack.scan(needle)</code>.</p>
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    1. POMatch comma separated list with Ruby Regex
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    1. USLi-aung Yip
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    1. COThanks, but this isn't Ruby and it's overkill for what I need. It also doesn't solve the problem, which has changed slightly from when I posted it. Sorry for the confusion!
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      1. USChristoph
    2. CO@Christoph: [You can't pull out an arbitrary number of match groups (`\1, \2, \3...`) with one match.](http://stackoverflow.com/questions/464736/python-regular-expressions-how-to-capture-multiple-groups-from-a-wildcard-expr) You're going to need `string.scan(pattern)`. Also the fact that the example is in Python is no obstacle to using it in Ruby - regular expressions are [mostly the same between them.](http://www.regular-expressions.info/refflavors.html)
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    3. COYeah maybe. Or capture a repeating group like explained here: http://www.regular-expressions.info/captureall.html
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