All checks have passed 🎉 @TomasVotruba I am merging it ;)

@kenjis it seems RegexPatternDetector::isRegexPattern() doesn't check identifier, eg: /u or /i or /anything, so it will always skipped if regex contains identifier:

https://getrector.com/demo/4114fea0-ee00-4394-a714-b3e325a3dd8b

which regex identifier can be any of imsxeADSUXJu, it was exists in ConsistentPregDelimiterRector, just removed at

https://github.com/rectorphp/rector-src/pull/3797/files#diff-b52d5691f8efd8fdd8b301dd7b8110eb3048ca332e76619f030a6a89f5764278

The logic of ConsistentPregDelimiterRector (that removed) should be bring back to verify that

@samsonasik It seems the delimiters are limited.
https://getrector.com/demo/01a2e742-ed67-4dde-9e66-d1ef58d6275c

Yes 👍

RegexPatternDetector was designed for common delimiter used, other than that, just skipped. I think we can focus on what more important part, the identifier usage: imsxeADSUXJu

Yeah, identifiers are more important.