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Table 15. Testing simple leftmost-longest matches (platform = linux, compiler = GNU C++ version 5.1.0)
| 
                    Expression | std::regex | boost 1.59 | POSIX | 
|---|---|---|---|
| 
                     | 
                    1.00 | 
                    1.25 | 
                    3.45 | 
| 
                     | 
                    4.60 | 
                    1.00 | 
                    12.80 | 
| 
                     | 
                    1.28 | 
                    1.00 | 
                    2.61 | 
| 
                     | 
                    1.11 | 
                    1.00 | 
                    2.44 | 
| 
                     | 
                    1.24 | 
                    1.00 | 
                    2.61 | 
| 
                     | 
                    1.61 | 
                    1.76 | 
                    1.00 | 
| 
                     | 
                    1.66 | 
                    1.79 | 
                    1.00 | 
| 
                     | 
                    1.69 | 
                    3.70 | 
                    1.00 | 
| 
                     | 
                    2.23 | 
                    2.63 | 
                    1.00 | 
| 
                     | 
                    1.97 | 
                    2.70 | 
                    1.00 | 
| 
                     | 
                    2.38 | 
                    3.31 | 
                    1.00 | 
| 
                     | 
                    2.12 | 
                    2.90 | 
                    1.00 | 
| 
                     | 
                    2.25 | 
                    2.89 | 
                    1.00 | 
| 
                     | 
                    1.20 | 
                    2.38 | 
                    1.00 |