[SOLVED] Dynamic sed to replace part of string

Issue

Well I have a project that was made upgrade from php 7.4 to 8.1

so many functions in someway doesn't work as before because in php 8.1 doesn't accept null anymore.

So I want to replace all functions with a script so I could automation it.

Example:

         line not affected before
explode(self::RULE_KEY_SEPARATOR, $key); somethingAfter
         testeBefore  explode(somthing, $key); somethingAfter
line not affected after

Output:

         line not affected before
explode(self::RULE_KEY_SEPARATOR, $key ?? ''); somethingAfter
         testeBefore  explode(something, $key ?? ''); somethingAfter
line not affected after

So a solution could be add ?? '' before close the parentesis of the function

here a snippet of what I tried to do: https://sed.js.org/?snippet=xqo9gd

I don't know if this is possible with sed.

If someone could help. I would appreciate :)

EDIT:

if snippet isn't available I will let here my try and output

I tried:

's/^\(.*\?\?\).*explode\(.*\).*/explode(self::RULE_KEY_SEPARATOR, $key ?? '\'''\''\);/g'

Output:

         line not affected before
explode(self::RULE_KEY_SEPARATOR, $key ?? '');
explode(self::RULE_KEY_SEPARATOR, $key ?? '');
line not affected after

As expected since is not dynamically...

Solution

Your current command has a few issues;

• You create a capture group but do not utilize it therefore losing all leading whitespace
• After explode, you are creating another capture group rather than matching the parenthesis literally
• After the second capture group, you use a greedy regex to capture and discard the remainder of the line.
• You are hardcoding the replace value rather than using the values already present

You can try this sed

$ sed "s/explode([^)]*/& ?? ''/" input_file
         line not affected before
explode(self::RULE_KEY_SEPARATOR, $key ?? ''); somethingAfter
         testeBefore  explode(somthing, $key ?? ''); somethingAfter
line not affected after

Answered By - sseLtaH

Answer Checked By - David Marino (WPSolving Volunteer)