Sed with variable

Sed replace with variable

Just concatenate var '"$var"' to replace values string in sed command:
$ sed -i 's/string_to_replace/'"$var"'/g' file_to_replace.txt

Sed with variable

sed -i "s/$var1/ZZ/g" "$file"

Source: askubuntu.com

Bash sed with variable

# If you want to store your regex in a bash variable 
# and use it in sed, you might need the following
BASE_REGEX="[0-9]{4}\.[0-9]+"
REGEX_ESCAPED=$(sed 's/[}{)(+]/\\&/g; s/\^/\\^/g' <<< "$BASE_REGEX")

# One variable can be used with sed
sed -i "s/${REGEX_ESCAPED}/REPLACEMENT/g" file.txt
# The other can be used with bash internal regex operator
if [[ "2022.42" =~ ^${BASE_REGEX}$ ]]
then
	echo 'Matches !'
fi

Similar codes

0 vote335 views1 answer
Install wsl kali linux large full
Shell/Bash
1 vote308 views2 answers
Logout of git cli
Shell/Bash
0 vote325 views2 answers
Laravel sanctum instalation
Shell/Bash
9 votes351 views2 answers
Yup npm
Shell/Bash
1 vote331 views1 answer
How to upload to github repo from terminal
Shell/Bash
0 vote322 views1 answer
Git change email of old commit
Shell/Bash
11 votes327 views4 answers
Install phpmyadmin ubuntu 18.04
Shell/Bash
1 vote327 views1 answer
Sudo cd command not found
Shell/Bash
0 vote301 views1 answer
Obs studio fedora
Shell/Bash
28 votes373 views6 answers
Composer install
Shell/Bash