programming with grep

George2 · 11-17-2006, 04:55 AM

Hello everyone,

I am programming with grep command in my C/C++ application to steal its string manipulation functions. :-)

I have completed several simple cases. I am meeting issues with two cases, and I am wondering how to represent it in grep.

1. find the lines contain "foo" or "goo";
2. find the lines contain "foo" but no "goo".

could anyone help please?

thanks in advance,
George

**Salem** · 11-17-2006, 06:32 AM

> I am programming with grep command in my C/C++ application to steal its string manipulation functions. :-)
Ugh!

Try using the regexp library which presents the same functionality as grep but without all the expensive overhead of spawning a separate process every time you want to do something.

> 1. find the lines contain "foo" or "goo";
egrep '[fg]oo'

George2 · 11-17-2006, 06:49 AM

Thank you Salem!

Quote:

Originally Posted by Salem

> 1. find the lines contain "foo" or "goo";
egrep '[fg]oo'

Your method does not work in this case. How to find the string contains either "abc" or "def"? Any general ways to implement or logics?

regards,
George

**Salem** · 11-17-2006, 06:54 AM

Code:

egrep 'read|the|manual' file.txt

George2 · 11-18-2006, 03:30 AM

Cool Salem, thank you!

Quote:

Originally Posted by Salem

Code:

egrep 'read|the|manual' file.txt

regards,
George

11-17-2006, 04:55 AM	#1
George2 Registered User Join Date: May 2006 Posts: 1,579	programming with grep Hello everyone, I am programming with grep command in my C/C++ application to steal its string manipulation functions. :-) I have completed several simple cases. I am meeting issues with two cases, and I am wondering how to represent it in grep. 1. find the lines contain "foo" or "goo"; 2. find the lines contain "foo" but no "goo". could anyone help please? thanks in advance, George
George2 is offline

11-17-2006, 06:32 AM	#2
Salem and the hat of Jobseeking Join Date: Aug 2001 Location: The edge of the known universe Posts: 21,640	> I am programming with grep command in my C/C++ application to steal its string manipulation functions. :-) Ugh! Try using the regexp library which presents the same functionality as grep but without all the expensive overhead of spawning a separate process every time you want to do something. > 1. find the lines contain "foo" or "goo"; egrep '[fg]oo' __________________ If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
Salem is offline

11-17-2006, 06:54 AM	#4
Salem and the hat of Jobseeking Join Date: Aug 2001 Location: The edge of the known universe Posts: 21,640	Code: egrep 'read\|the\|manual' file.txt __________________ If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
Salem is offline

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