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Vilmerok

02-26-2009 07:23 AM

sed - regular expression

I need to extract substring :

my_string="foo bar(*.*)";

in variable1 should be "foo bar"
in variable2 should be "*.*"

So, everything text beetwen () should be in variable2.

How to create sed regexp for it?

colucix

02-26-2009 07:30 AM

Code:

variable1=$(echo $my_string | sed 's/\(.*\)(.*/\1/')

variable2=$(echo $my_string | sed 's/.*(\(.*\))/\1/')

A must-reading to learn sed programming: http://www.grymoire.com/Unix/Sed.html

pixellany

02-26-2009 07:33 AM

Homework?

colucix

02-26-2009 07:34 AM

Quote:

Originally Posted by pixellany (Post 3458097)

Homework?

Oops... I didn't think about that... sorry!

Vilmerok

02-26-2009 07:55 AM

Quote:

Originally Posted by colucix (Post 3458095)

Code:

variable1=$(echo $my_string | sed 's/\(.*\)(.*/\1/')

variable2=$(echo $my_string | sed 's/.*(\(.*\))/\1/')

A must-reading to learn sed programming: http://www.grymoire.com/Unix/Sed.html

This works, but not correctly:

Code:

c="foo bar(*)"

e=`echo "$c" | sed 's/.*(\(.*\))/\1/'`                                                                                                                      f=`echo "$c" | sed 's/\(.*\)(.*/\1/'`



echo "$e"

echo "$f"



[@my myscript]$ ./script1.sh

*

foo bar

This is perfect!

But if c="foo bar"
[

Code:

@my myscript]$ ./script1.sh

foo bar

foo bar



But should be:

[@my myscript]$ ./script1.sh



foo bar

colucix

02-26-2009 08:44 AM

This should work:

Code:

e=$(echo $c | sed '/(/!d; /(/s/.*($.*$).*/\1/')

it means "for lines not containing parenthesis delete the whole line" while "for lines containing parentheses extract the string within them".

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