Installation of symfony/flex throw error "preg_match() expects parameter 2 to be string, object given" #759
Description
I tried to add symfony/flex to my project but this throws an exception. I tried to clear cache, remove vendor directory, remove composer.lock, also I tried different versions of Symfony 4.4, 5.1, 5.2 - the result is the same:
# composer require symfony/flex
Using version 1.12.x-dev for symfony/flex
./composer.json has been updated
Running composer update symfony/flex
Loading composer repositories with package information Updating dependencies
Lock file operations: 1 install, 0 updates, 0 removals
- Locking symfony/flex (dev-main 9d71b2f)
Writing lock file
Installing dependencies from lock file (including require-dev)
Package operations: 1 install, 0 updates, 0 removals
- Installing symfony/flex (dev-main 9d71b2f): Extracting archive
Plugin initialization failed (preg_match() expects parameter 2 to be string, object given), uninstalling plugin
- Removing symfony/flex (dev-main 9d71b2f)
Install of symfony/flex failed
Installation failed, reverting ./composer.json and ./composer.lock to their original content.
[ErrorException]
preg_match() expects parameter 2 to be string, object given
require [--dev] [--dry-run] [--prefer-source] [--prefer-dist] [--fixed] [--no-suggest] [--no-progress] [--no-update] [--no-install] [--no-scripts] [--update-no-dev] [-w|--update-with-dependencies] [-W|--update-with-all-dependencies] [--with-dependencies] [--with-all-dependencies] [--ignore-platform-req IGNORE-PLATFORM-REQ] [--ignore-platform-reqs] [--prefer-stable] [--prefer-lowest] [--sort-packages] [-o|--optimize-autoloader] [-a|--classmap-authoritative] [--apcu-autoloader] [--apcu-autoloader-prefix APCU-AUTOLOADER-PREFIX] [--] [<packages>]...