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2017 Jan 06
0
strsplit(perl=TRUE), gregexpr(perl=TRUE) very slow for long strings
...est function times gsub, strsplit, and gregexpr, with perl TRUE (PCRE) and FALSE (TRE), when the input string contains 'n' matches to the given pattern. Notice the quadratic (in n) time growth for the StrSplitPCRE and RegExprPCRE columns. > regex.perf.test(N=2^(11:20)) N SubTRE SubPCRE StrSplitTRE StrSplitPCRE RegExprTRE RegExprPCRE elapsed 2048 0.00 0.00 0.00 0.00 0.00 0.00 elapsed 4096 0.00 0.00 0.01 0.00 0.00 0.00 elapsed 8192 0.00 0.00 0.00 0.01 0.00 0.01 elaps...