pcre | latest release of PCRE

In your regex, there are Unicode property classes whose syntax is not compliant with ECMAScript 2018+ standard, and the named capturing group syntax is different across the two engines. More, since you have to use Unicode property classes in the ECMAScript regex, you need to use the /u flag, and it requires a stricter approach to escaping special chars, so you need to make sure you only escape what you must escape. Besides, \A and \Z / \z anchors are not supported in ECMAScript regex flavor, just use ^ and $.

Here are examples of what is changed:

• Removed the comments as the COMMENT / FREESPACING mode (usually enabled with /x or (?x) flags/options) is not supported in ECMAScript regex
• (?P.*?) => (?.*?) (the P after ? is not supported)
• \pN => \p{N} (the Unicode category name/alias must appear inside curly braces)
• [\-a-zA-Z] => [-a-zA-Z] and \# => # (unnecessary escapes, mandated by the use of /u flag)
• \A => ^ (unsupported anchor)
• \Z => $ (unsupported anchor)

You can use

According to man7.org getifaddrs, any of the socket operations could be a cause for EBADF

ERRORS

getifaddrs() may fail and set errno for any of the errors specified for socket(2), bind(2), getsockname(2), recvmsg(2), sendto(2), malloc(3), or realloc(3).

Unrelated, but do you do freeifaddrs() somewhere?

You can downgrade your Python version. That should solve your problem; if not, use collections.abc.Mapping instead of the deprecated collections.Mapping.

Refer here: Link

I worked it out; the issue was that I didn't realise that when you install Passenger as a dynamic module, you still need to do the same config as with a regular install. In particular, in your nginx.conf, you need to add this to the http block:

With a capture group:

One practical approach for all of it is to use Text::Unidecode

Converting my comment to answer so that solution is easy to find for future visitors.

This problem doesn't need to use fancy PCRE feature as it can be solved using standard regex with a negated character class (assuming we are not onto complex cases of nested or escaped parentheses):

See this explanation:

if there is no subpattern named 'R', the condition is true if a recursive call to the whole pattern or any subpattern has been made

This implies that (?(R) condition checks if the whole pattern was recursed at least once, and the result of the check is boolean, either True if recursion took place, or False otherwise.

If you need to check some examples, see https://github.com/PhilipHazel/pcre2/blob/587b94277b50ababde2380b5877c93e36ca65db8/src/pcre2_jit_test.c.

You need these regexps: