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I asked similar question at: http://stackoverflow.com/questions/38410982/superfast-regexmatch-in-large-text-file

I asked similar question at: https://stackoverflow.com/questions/38410982/superfast-regexmatch-in-large-text-file

.

f.txt is at: http://patents.reedtech.com/downloads/PatentMaintFeeEvents/1981-present/MaintFeeEvents.zip

data.txt is at: http://hastebin.com/benacubebu.lisp (if I saved it right).

f.txt has ~ 14 million lines, and looks like this:

4287053 06218896 N 19801222 19810901 19881222 M171 
4287053 06218896 N 19801222 19810901 19850211 M170 
4289713 06222552 Y 19810105 19810915 19930330 SM02 
4289713 06222552 Y 19810105 19810915 19930303 M285 
4289713 06222552 Y 19810105 19810915 19921208 RMPN 
4289713 06222552 Y 19810105 19810915 19921208 ASPN 
4289713 06222552 Y 19810105 19810915 19881116 ASPN 
4289713 06222552 Y 19810105 19810915 19881107 M171 
4289713 06222552 Y 19810105 19810915 19850306 M170 
4291808 06215853 N 19801212 19810929 19851031 EXP. 
4291808 06215853 N 19801212 19810929 19850812 REM. 
4292069 06227825 N 19810123 19810929 19930926 EXP. 
4292069 06227825 N 19810123 19810929 19890323 ASPN 
4292069 06227825 N 19810123 19810929 19890320 M171 
4292069 06227825 N 19810123 19810929 19850314 M170 
4292142 06224175 N 19810112 19810929 19930926 EXP. 
4292142 06224175 N 19810112 19810929 19890316 M171 
4292142 06224175 N 19810112 19810929 19861008 ASPN 
4292142 06224175 N 19810112 19810929 19850925 M170 
4292142 06224175 N 19810112 19810929 19850925 M176 
4292142 06224175 N 19810112 19810929 19850812 REM. 
...
RE45962 14454334 Y 20140807 20160405 20160323 ASPN 
RE45972 14335639 N 20140718 20160412 20160512 M1551
RE45975 14464421 N 20140820 20160412 20160511 M1551
RE45975 14464421 N 20140820 20160412 20160510 ASPN 
RE46021 13775962 N 20130225 20160531 20160621 M1551
RE46028 14491699 N 20140919 20160614 20160621 STOL 
RE46046 13755710 N 20130131 20160628 20160624 ASPN 
RE46051 10137107 N 20020502 20160705 20160624 ASPN 
RE46074 14249009 N 20140617 20160719 20160614 ASPN 

data.txt has ~ 200 lines, and looks like this:

6268343
6268343
6268343
6268343
6268343
6268343
7749955
8710181
6268343
6384016
6458924
...