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Table 9. Testing Perl searches (platform = linux, compiler = GNU C++ version 6.3.0)
| 
                    Expression | boost 1.65 | std::regex | boost::xpressive::cregex | PCRE-10.21 | 
|---|---|---|---|---|
| 
                     | 
                    1.63 | - | 
                    1.67 | 
                    1.00 | 
| 
                     | 
                    2.78 | - | 
                    1.50 | 
                    1.00 | 
| 
                     | 
                    1.95 | - | 
                    2.18 | 
                    1.00 | 
| 
                     | 
                    2.61 | - | 
                    1.61 | 
                    1.00 | 
| 
                     | 
                    1.69 | - | 
                    1.51 | 
                    1.00 | 
| 
                     | 
                    1.00 | - | - | 
                    2.84 | 
| 
                     | 
                    1.64 | - | 
                    1.00 | 
                    1.03 | 
| 
                     | 
                    1.72 | 
                    3.61 | 
                    1.00 | 
                    1.98 | 
| 
                     | 
                    1.00 | 
                    36.75 | 
                    1.40 | 
                    1.19 | 
| 
                     | 
                    1.00 | - | - | 
                    1.58 | 
| 
                     | 
                    1.31 | - | - | 
                    1.00 | 
| 
                     | 
                    1.46 | 
                    11.35 | 
                    1.00 | 
                    1.35 | 
| 
                     | 
                    1.41 | 
                    11.47 | 
                    1.00 | 
                    1.31 |