Regex for parsing sprintf style format with Apple privacy extensions

apple-fomat-regex.txt

# Ignore escape sequences %%
(?<!%)

# Match %
%

# Match extended attributes supported by OSLog, ie: {public, uuid_t} 
# See https://developer.apple.com/documentation/os/logging for built-in value decoders
(?:\{([\w-,\s]+)\}){0,1}

(
# Match length modifiers
# See https://developer.apple.com/library/archive/documentation/CoreFoundation/Conceptual/CFStrings/formatSpecifiers.html#//apple_ref/doc/uid/TP40004265
(?:(hh|ll|h|l|q|L|z|t|j){0,1}

# Match format specifier (see the link above)
[@dDuUxXoOfeEgGcCsSpaAF])

# OR
|

# Match OSLog built-in type decoders
(?:\.\*\d*P)

)

input.txt

time_t
%{time_t, public}d
2016-01-12 19:41:37

timeval
%{timeval, private}.*P
2016-01-12 19:41:37.774236

timespec
%{timespec}.*P
2016-01-12 19:41:37.2382382823

errno
%{errno}d
Broken pipe

iec-bytes
%{iec-bytes}d
2.64 MiB

bitrate
%{bitrate}d
123 kbps

iec-bitrate
%{iec-bitrate}d
118 Kibps

uuid_t
%{uuid_t}.*16P
%{uuid_t}.*P
10742E39-0657-41F8-AB99-878C5EC2DCAA

Sprintf standard
%s %d %O %LF %%f %s
Hello