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July 15, 2020 21:27
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Grammar regex matching Rust's std::fmt syntax (see: https://doc.rust-lang.org/std/fmt/#syntax)
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(?: | |
// argument | |
([0-9]+) // 1 integer, argument | |
| | |
(\\p{Alpha}\\w*|_\\w+) // 2 identifier, argument | |
)? | |
(?: | |
(\\:) // 3 separator | |
// format_spec | |
// fill/align | |
( // 4 punctuation | |
// fill | |
.? | |
// align | |
[<>\\^] | |
)? | |
// sign | |
([\\+\\-])? // 5 punctuation | |
// '#' | |
(#)? // 6 punctuation | |
// 0 | |
0? | |
// width | |
/// count | |
(?: | |
// parameter | |
// argument | |
((?: // 7 identifier, argument | |
([0-9]+) // 8 integer, argument | |
| | |
\\p{Alpha}\\w*|_\\w+ | |
)\\$) | |
| | |
// integer | |
([0-9]+) // 9 integer | |
)? | |
// '.' precision | |
(?: | |
\\. | |
// precision | |
(?: | |
// count | |
(?: | |
// parameter | |
/// argument | |
((?: // 10 identifier, argument | |
([0-9]+) // 11 integer, argument | |
| | |
\\p{Alpha}\\w*|_\\w+ | |
)\\$) | |
| | |
/// integer | |
([0-9]+) // 12 integer | |
) | |
| | |
\\* | |
) | |
)? | |
// type | |
(\\?|\\p{Alpha}\\w*|_\\w+)? // 13 identifier (maybe special) | |
)? |
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