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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  |