Created
June 2, 2016 03:13
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Filter lines consisting of balanced parentheses
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| h | |
| x | |
| s/$/0/ | |
| x | |
| : shift | |
| /^(/ { | |
| s/// | |
| x | |
| s/$/1/ | |
| x | |
| b shift | |
| } | |
| /^)/ { | |
| x | |
| /1$/! d | |
| s/// | |
| x | |
| s/^)// | |
| b shift | |
| } | |
| /./ d | |
| x | |
| /0$/! d | |
| s/// |
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