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Old 01-21-2008, 11:37 AM   #1
dazdaz
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egrep puzzle


Hi,

I was playing with egrep on Solaris 8 and wanted to egrep for either string 1 or string 2 and string 3.

This is the easy way.
egrep 'string1|string2' file | egrep string3

But I wanted to try and do it in 1 egrep, to see if it would work.


I tried this below which did'nt work to my surprise as I am sure it should...

egrep '(string1|string2)string3' file

Thanks for any tips.
 
Old 01-21-2008, 12:34 PM   #2
pixellany
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Works on my machine....what error are you getting?
 
Old 01-22-2008, 03:52 AM   #3
dazdaz
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Nope, does'nt work for me.

$ uname -r
5.8
$ cat -tv z
abcdef 1234/tcp # blah blah
xyz^I9999/tcp^I^I# comment field
$ egrep '(abc|xyz)blah' z
$ egrep '(abc|xyz)comment' z
$ echo $?
1
 
Old 01-22-2008, 04:10 AM   #4
greeneagle
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Smile

Quote:
Originally Posted by dazdaz View Post
for either string 1 or string 2 and string 3.
...
egrep '(string1|string2)string3' file
well that means grep for string1 or string2 followed by string3, doesn't it?

Do you mean
1. for either string 1 or (string 2 and string 3). ?
or
2. for (either string 1 or string 2) and string 3. ?

echo string1 > file
echo string2 >> file
echo string3 >> file
echo string1string3 >> file
echo string2string3 >> file

2.

egrep '(string1|string2)string3' file
string1string3
string2string3

1.

egrep '(string1|string2.*string3)' file
string1
string1string3
string2string3

What was the question again?

 
Old 01-22-2008, 04:15 AM   #5
greeneagle
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I think you want:

$ egrep '(abc|xyz).*blah' z
$ egrep '(abc|xyz).*comment' z

Otherwise it means match abcblah or xyzblah or nothing
.* means match any char (.) 0 or more times (*)

Quote:
Originally Posted by dazdaz View Post
$ cat -tv z
abcdef 1234/tcp # blah blah
xyz^I9999/tcp^I^I# comment field
$ egrep '(abc|xyz)blah' z
$ egrep '(abc|xyz)comment' z
 
  


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