Git Blacklist example does not work

[Jamesking56]

Q	A
Version	2.6.0
Bug?	yes
New feature?	no
Question?	no
Documentation?	yes
Related tickets

My configuration

# grumphp.yml
grumphp:
    tasks:
        git_blacklist:
            keywords:
                - "die\\("
                - "dd\\("
                - "var_dump\\("
                - "exit;"
                - "file_put_contents\\("
            triggered_by: ['php']
            regexp_type: G

Steps to reproduce:

# Generate empty folder
mkdir tmp
cd tmp
git init
echo "vendor" > .gitignore
pbpaste > grumphp.yml
composer require --dev phpro/grumphp

# Your actions
# Please add the steps on how to reproduce the issue here.
Add config file from above

# Run GrumPHP:
git add -A && git commit -m"Test"
# or
./vendor/bin/grumphp run

Result:

git_blacklist
=============

Something went wrong:
fatal: -e option, 'die\(': Unmatched ( or \(

This config matches the config in the docs here: https://github.com/phpro/grumphp/blob/v2.x/doc/tasks/git_blacklist.md

[veewee]

You might need to escape the character twice to make sure it is escaped in both yaml and next in your git cli command.

An alternative solution is to use:
https://github.com/phpro/grumphp/blob/v2.x/doc/tasks/phpparser.md

Or phpstan with https://github.com/ekino/phpstan-banned-code.

Both use PHP's AST to figure out if it's allowed or not which is less error prone on input like dump[space](
Whilst the blacklist task only checks for a regex match.

(It has been reported in #1139 as well.)