feat(forge): Solidity cheat to find and replace text in bytes and string variables

[PaulRBerg]

Component

Forge

Describe the feature you would like

Suppose you have a differential test that compares the bytecodes of a contract deployed using two different methods, e.g. see deployPermit2.

Now, imagine the contract-under-test takes a storage record of its address(this) in the constructor. In this case, the two deployment methods would produce two slightly different bytecodes (only ~20 bytes would be different), so the differential test would fail.

There are various ways to fix this using vm.ffi, but it would be nice to have a native find-and-replace cheat so that users don't have to exit Solidity in this scenario.

Additional context

Late edit: it looks like I could use Solady's LibString for this.

[Tudmotu]

I would also like this feature.

LibString is not sufficient for me since I need UTF support. solidity-stringutils is too low-level and too slow for my needs.

What I have in mind is this interface:

function stringReplaceAll (string memory source, string memory pattern, string memory replacement);

Where pattern will be a regex (as in Regex::new(pattern).unwrap()) and the cheatcode would invoke .replace_all(source, replacement).

@PaulRBerg @mattsse WDYT?

[zerosnacks]

Marking as resolved by #6891, implementing native cheatcodes for working with strings, including replace

Feel free to re-open if there are still action items @Tudmotu / @PaulRBerg