Substitute expression (magic)
| - | - |
|---|---|
& * | * \0 |
\1…\9 | Replace with the group 0-9 |
\u | Uppercase next letter |
\U | Uppercase following characters |
\l | Lowercase next letter |
\L | Lowercase following characters |
\e | End of \u, \U, \l and \L |
\E | End of \u, \U, \l and \L |
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