>>> OP version
Matched 'regexes' in: I'm trying to search for several regexes in some long files. To speed things up,
Matched '^I' in: I'm trying to search for several regexes in some long files. To speed things up,
Matched '^I' in: I tried first checking a combined regex, to see if any of them matches the line.
Matched 'regexes' in: This seems to speed things up, at least when the regexes are just plain words.
Matched 'regexes' in: But: If I try input regexes which are anchored ("^word"), then suddenly it's
Matched 'that' in: (I could rewrite ^aaa|^bbb|^ccc as ^(aaa|bbb|ccc), but it might be that only

>>> Grandfather version
Matched 'I' in: I'm trying to search for several regexes in some long files. To speed things up,
Matched 'regexes' in: I'm trying to search for several regexes in some long files. To speed things up,
Matched 'I' in: I tried first checking a combined regex, to see if any of them matches the line.
Matched 'regexes' in: This seems to speed things up, at least when the regexes are just plain words.
Matched 'regexes' in: But: If I try input regexes which are anchored ("^word"), then suddenly it's
Matched 'that' in: (I could rewrite ^aaa|^bbb|^ccc as ^(aaa|bbb|ccc), but it might be that only