Is there documentation for Regex syntax?

Using Swift
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When I say documentation, I mean to document what are the symbols and the meanings in a regex literal expression, such as what does /d mean, or ?,+, etc.

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Swift's regex implementation follows several regex standards, so the documentation for any of them will likely work. Here are some interactive tutorials.. I can't vouch for their quality, but it seems like a gentle intro.

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I personally like to use a good online regex tool like https://regex101.com/ for trying things out.

In addition to an entry tutorial you should have a look at the very useful lookahead feature. E.g. when you do replacements, this feature can save you from having to apply a replacement several times. (Note that at least with the new regex literals, look-behinds are not available in Swift, only look-aheads.)

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Each language has its own "flavor" for (literal) regex syntax.