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    <p>It could probably be done in a single regex if there is no nesting.<br> There is a concept of delimeters roughly defined, and it is possible to 'bias'<br> those rules to get a better outcome.<br> It all depends on what rules are set forth. This regex takes into account<br> three possible scenario's in order;</p> <ol> <li>Valid Pair </li> <li>Invalid Pair (with bias) </li> <li>Invalid Single</li> </ol> <p>It also doesen't parse "" beyond end of line. But it does do multiple<br> lines combined as a single string. To change that, remove <code>\n</code> where you see it. </p> <hr> <p>global context - raw find regex<br> <strong>shortened</strong></p> <pre><code>(?:("[a-zA-Z0-9\p{Punct}][^"\n]*(?&lt;=[a-zA-Z0-9\p{Punct}])")|(?&lt;![a-zA-Z0-9\p{Punct}])"([^"\n]*)"(?![a-zA-Z0-9\p{Punct}])|") </code></pre> <p>replacement grouping</p> <pre><code>$1$2 or \1\2 </code></pre> <p>Expanded raw regex: </p> <pre><code>(?: // Grouping // Try to line up a valid pair ( // Capt grp (1) start " // " [a-zA-Z0-9\p{Punct}] // 1 of [a-zA-Z0-9\p{Punct}] [^"\n]* // 0 or more non- [^"\n] characters (?&lt;=[a-zA-Z0-9\p{Punct}]) // 1 of [a-zA-Z0-9\p{Punct}] behind us " // " ) // End capt grp (1) | // OR, try to line up an invalid pair (?&lt;![a-zA-Z0-9\p{Punct}]) // Bias, not 1 of [a-zA-Z0-9\p{Punct}] behind us " // " ( [^"\n]* ) // Capt grp (2) - 0 or more non- [^"\n] characters " // " (?![a-zA-Z0-9\p{Punct}]) // Bias, not 1 of [a-zA-Z0-9\p{Punct}] ahead of us | // OR, this single " is considered invalid " // " ) // End Grouping </code></pre> <p>Perl testcase (don't have Java) </p> <pre><code>$str = ' string1=injunct! alter ego." string2=successor "alter ego" single employer "a" free" proceeding "citation assets" '; print "\n'$str'\n"; $str =~ s / (?: ( "[a-zA-Z0-9\p{Punct}] [^"\n]* (?&lt;=[a-zA-Z0-9\p{Punct}]) " ) | (?&lt;![a-zA-Z0-9\p{Punct}]) " ( [^"\n]* ) " (?![a-zA-Z0-9\p{Punct}]) | " ) /$1$2/xg; print "\n'$str'\n"; </code></pre> <p>Output </p> <pre><code>' string1=injunct! alter ego." string2=successor "alter ego" single employer "a" free" proceeding "citation assets" ' ' string1=injunct! alter ego. string2=successor "alter ego" single employer "a" free proceeding "citation assets" ' </code></pre>
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    1. POHow to remove unbalanced/unpartnered double quotes (in Java)
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    1. COThanks for a detailed and an informative answer.
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    2. CO@S. Singh - Thanks for asking this interresting question.
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