docs(blog): Add tip about regex testers / 2023-05-12-git-diff.md

[cyrilbois]

Hi, I added a tip to check regular expressions with online regex testers, such as regex101 and Cyrilex (my website), in the blog post dated 2023-05-12-git-diff.md

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[necatiozmen]

Thanks for the PR but however we'll planing to update article later with more informations.

[cyrilbois]

Thank you for your reply.