@ygemici
Grep is just used here to demonstrate the extended regular expression in action.
The OP has requested we not use the negation options (! or -v), as these add complexity to the system requiring them.
I can't see any problem with the R.E I supplied; can you supply a string that gives a false positive/negative?
Remember this R.E. is supposed to match any line that doesn't contain "this" or "that".
Ok I already understand but may be many scenarios in our case..
Quote:
Originally Posted by stevensw
With find -regex (with -regextype posix extended) not sed or grep. It is for an auditing script that checks for non-standard filenames.
I guess he wants to determine some rules for user specific conditons to write regex.
But different (sed or awk or grep or perl or ruby or anys (differs in different architectures) ,,can may use different convention as in defined reg libraries..
And according to me , not to use (! or -v) is unobtainable for fixed words
because of this is just significant meaningful for common definitions.So these are already defined for this purpose.
== e.g ==
Code:
# cat audit.log
type=USER_END msg=audit(1304758861.275:29289): user pid=15381 uid=0 auid=0 msg='PAM: session close acct="root" : exe="/usr/sbin/crond" (hostname=?, addr=?, terminal=cron res=success)'
For audit log , I try to write a some regex
[ REGEX= (must be Perl-compatible RegEx) ]
Although we dont know will be use which regex library(posix or not or gnu).Just guess..
Now lets look your grep.
for example
Code:
# cat file1
test line is ok!!
test2 line is ok!!!
thissand is ok?
thatcher just way iss OKKs!!
line is that NotOk!!
12 that NotOk!!
that line is notOK
what isthat?
what isthis?
this!!! ok??
that there is a tab
this is a test
that is a test
this12 is a test
atthis Ok!!
atthat is OK!!
cthats s not OK!!
isthisisokkk
isthatsisokkk
And some lines are missing and some lines has in..
Code:
# grep -E '^([^t]|t[^h]|th[^ia]|thi[^s]|tha[^t])*.{0,3}$' file1
test line is ok!!
test2 line is ok!!!
atthis Ok!!atthat is OK!!
below is desired output ? I dont think so..
Code:
# grep -Ev "this|that" file1
test line is ok!!
test2 line is ok!!!
now try to grep with wordregexp only supplies containing matches with non_words (not punct)
Code:
# grep -Ewv "this|that" file1
test line is ok!!
test2 line is ok!!!
thissand is ok?
thatcher just way iss OKKs!!
what isthat?
what isthis?
this12 is a test
atthis Ok!!
atthat is OK!!
cthats s not OK!!
isthisisokkk
isthatsisokkk
Try justdoit code (according to me the correct result)
Code:
# ./justdoit2 "this" "that" file1 (this supplies just inverts matches with "this" and "that")
test line is ok!!
test2 line is ok!!!
thissand is ok?
thatcher just way iss OKKs!!
what isthat?
what isthis?
this!!! ok??
this12 is a test
atthis Ok!!
atthat is OK!!
cthats s not OK!!
isthisisokkk
isthatsisokkk
and maybe we get same with this (equals to justdoit)
I modified your --extended-regexp
Code:
# grep -E '^([^t]|t[^h]|th[^ia]|thi[^s]|tha[^t]|that[^ '$'\t]|this[^ '$'\t])*.{0,3}$' file1
test line is ok!!
test2 line is ok!!!
thissand is ok?
thatcher just way iss OKKs!!
what isthat?
what isthis?
this!!! ok??
this12 is a test
atthis Ok!!
atthat is OK!!
cthats s not OK!!
isthisisokkk
isthatsisokkk
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