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Table 13. Testing Perl searches (platform = Windows x64, compiler = Microsoft Visual C++ version 14.1)
| 
                   
                    Expression  | 
                   boost 1.65  | 
                   PCRE-10.10  | 
                   RE2  | 
                   std::regex  | 
                   boost::xpressive::cregex  | 
|---|---|---|---|---|---|
| 
                   
                      | 
                   
                    1.36  | 
                   
                    1.00  | 
                   
                    1.08  | 
                   -  | 
                   
                    2.89  | 
| 
                   
                      | 
                   
                    3.05  | 
                   
                    1.58  | 
                   
                    1.00  | 
                   -  | 
                   
                    3.31  | 
| 
                   
                      | 
                   
                    2.11  | 
                   
                    1.31  | 
                   
                    1.00  | 
                   -  | 
                   
                    4.28  | 
| 
                   
                      | 
                   
                    2.73  | 
                   
                    1.41  | 
                   
                    1.00  | 
                   -  | 
                   
                    3.14  | 
| 
                   
                      | 
                   
                    2.32  | 
                   
                    1.57  | 
                   
                    1.00  | 
                   -  | 
                   
                    3.76  | 
| 
                   
                      | 
                   
                    1.00  | 
                   
                    2.90  | 
                   -  | 
                   -  | 
                   -  | 
| 
                   
                      | 
                   
                    1.55  | 
                   
                    1.00  | 
                   -  | 
                   -  | 
                   
                    1.46  | 
| 
                   
                      | 
                   
                    26.17  | 
                   
                    32.97  | 
                   
                    1.00  | 
                   
                    811.84  | 
                   
                    23.34  | 
| 
                   
                      | 
                   
                    1.58  | 
                   
                    1.00  | 
                   
                    2.48  | 
                   
                    5.39  | 
                   
                    1.09  | 
| 
                   
                      | 
                   
                    1.00  | 
                   
                    1.70  | 
                   -  | 
                   -  | 
                   -  | 
| 
                   
                      | 
                   
                    1.62  | 
                   
                    1.00  | 
                   -  | 
                   -  | 
                   -  | 
| 
                   
                      | 
                   
                    1.48  | 
                   
                    1.08  | 
                   
                    1.78  | 
                   
                    7.75  | 
                   
                    1.00  | 
| 
                   
                      | 
                   
                    1.48  | 
                   
                    1.08  | 
                   
                    1.76  | 
                   
                    7.72  | 
                   
                    1.00  |