regexp/syntax: accept (?<name>...) syntax as valid capture

[mauri870]

Currently the only named capture supported by regexp is (?Pa).

The syntax (?a) is also widely used and there is currently an effort from
the Rust regex and RE2 teams to also accept this syntax.

Fixes #58458

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[gopherbot]

Message from Ian Lance Taylor:

Patch Set 1: Run-TryBot+1

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Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Message from Gopher Robot:

Patch Set 1: TryBot-Result+1

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This PR (HEAD: 31b50e6) has been imported to Gerrit for code review.

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Message from Ian Lance Taylor:

Patch Set 2: Auto-Submit+1 Code-Review+2 Run-TryBot+1

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Patch Set 2:

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Message from Gopher Robot:

Patch Set 2: TryBot-Result+1

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This PR is being closed because golang.org/cl/513838 has been merged.