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Can egrep do lookaheads or behinds? I find it necessary to use positive lookaheads to verify the test words include all the letters marked present but in the wr
by sizzzzlerz 5y ago
Can egrep do lookaheads or behinds? I find it necessary to use positive lookaheads to verify the test words include all the letters marked present but in the wrong location.
- lancebeet 5y agoI was also curious about this as I use grep -P (for PCRE regexes) if I need to use them. Looking at the manual, lookaheads and lookbehinds don't seem to be supported by regular gnu grep or grep -E, so you do need to use grep -P for them. https://www.gnu.org/software/grep/manual/grep.pdf https://www.gnu.org/software/grep/manual/grep.pdf