(SOLVED) Search and Replace Exact string without removing the line

pedropt · 09-09-2017, 02:24 PM

I have this text :

Quote:

I (love) rock & roll he (love) rock & rool john (love) dance
you (love) rock he (love) rock & rool

I want to remove only :
(love)

leaving as example text :

Quote:

I rock & roll he rock & rool john dance
you rock he rock & rool

The problem that i am facing are the () in the text i want to replace or delete if possible without messing up with the other text .

Code:

var=$(cat text.txt |sed "/\'(love)'//d")
echo $var

It is not working as i need .
Any solutions ?

NevemTeve · 09-09-2017, 02:30 PM

Code:

sed 's/\(love\)//g' text.txt >output.txt

Turbocapitalist · 09-09-2017, 02:31 PM

Three tips: Skip the cat. Don't search for doube quotes if they are not in the target string. Check the substitution command in sed

Code:

man sed

pedropt · 09-09-2017, 02:37 PM

Code:

sed 's/\(love\)//g' text.txt >output.txt

is not working , it removes the word "love" but not the complete (love) as i want .
using that command i get :

Quote:

I () rock & roll he () rock & rool john () dance
you () rock he () rock & rool

pedropt · 09-09-2017, 02:50 PM

Just got it .

Quote:

sed -e "s/(love)//g"

NevemTeve · 09-10-2017, 12:20 AM

Sorry, you're right, the code I suggested doesn't work; ()parentheses without \backslash are interpreted as literal characters, with \backslash are acting as grouping operators.

Some examples for myself

Code:

$ echo 'ApartB' | sed 's/ApartB/a&b/g' # '&': total back-reference
aApartBb

$ echo 'A(part)B' | sed 's/A(part)B/a&b/g' # '&': total back-reference
aA(part)Bb

$ echo 'ApartB' | sed 's/A\(part\)B/a\1b/g' # '\1': partial back-reference
apartb

$ echo 'A(part)B' | sed 's/A(\(part\))B/a\1b/g' # '\1': partial back-reference
apartb

$ echo 'A(part)B' | sed 's/A\((part)\)B/a\1b/g' # '\1': partial back-reference
a(part)b

MadeInGermany · 09-10-2017, 03:53 AM

You must distinguish between BRE style, grep, sed, expr, where \( \) are special for grouping,
and ERE style, egrep, grep -E, sed -r, awk, perl, where ( ) are special for grouping.