Searches and replaces the zoo.color to zoo['color'] or zoo.animals to zoo['animals']:
cat zoo.js | sed -E "s/(zoo)(\.)([a-zA-Z0-9]*)/\1['\3']/g"|less
\1 = is the characters inside the first parenthesis w/c is the zoo
\3 = is the characters inside the third parenthesis which involves alpha-numeric
-E will interpret as regular expressions as extended (modern) regular expressions rather than basic regular expressions (BRE's)
Another example, you can use this for replacing such a string let say, in a SQL statement,
example SQL string:
CREATE DEFINER=`mysqluser`@`%` FUNCTION `total`(cost DOUBLE, income DOUBLE, lng2 DOUBLE) RETURNS double
And you wanted to remove DEFINER=`mysqluser`@`%` and allow FUNCTION to be a dynamic string so you'll just need to catch that string. So you can use backreferences with sed.
$> cat query.sql | sed -e 's/DEFINER.*\@.*\s\([A-Za-z]*\)\s`/\'1' `/g'
CREATE FUNCTION `total`(cost DOUBLE, income DOUBLE, lng2 DOUBLE) RETURNS double
Hope this helps.