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Add proper footnotes to tutorial.md (#1235)

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Signed-off-by: RD WebDesign <github@rdwebdesign.com.br>
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RD WebDesign
2025-07-20 01:54:30 -03:00
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parent 406dc71468
commit 05d653748f
1 changed files with 7 additions and 5 deletions
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docs/regex/tutorial.md
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@@ -92,10 +92,10 @@ In addition to character groups, there are also some special character classes a
Character class | Equivalent | Pi-hole specific | Interpretation
--------------- | ---------------- | ---------------- | ---------------
`[[:digit:]]` | `[0-9]` | No | digits
`[[:lower:]]` | `[a-z]` | No | lowercase letters*
`[[:upper:]]` | `[A-Z]` | No | uppercase letters*
`[[:alpha:]]` | `[A-Za-z]` | No | alphabetic characters*
`[[:alnum:]]` | `[A-Za-z0-9]` | No | alphabetic characters* and digits
`[[:lower:]]` | `[a-z]` | No | lowercase letters[^*]
`[[:upper:]]` | `[A-Z]` | No | uppercase letters[^*]
`[[:alpha:]]` | `[A-Za-z]` | No | alphabetic characters[^*]
`[[:alnum:]]` | `[A-Za-z0-9]` | No | alphabetic characters[^*] and digits
`[[:blank:]]` | `[ \t]` | Yes | blank characters
`[[:cntrl:]]` | N/A | Yes | control characters
`[[:graph:]]` | N/A | Yes | all printable characters except space
@@ -104,7 +104,9 @@ Character class | Equivalent | Pi-hole specific | Interpretation
`[[:space:]]` | `[ \f\n\r\t\v]` | Yes | white-space characters
`[[:xdigit:]]` | `[0-9a-fA-F]` | Yes | hexadecimal digits
\* FTL matches case-insensitive by default as case does not matter in domain names
///Footnotes Go Here///
[^*]: FTL matches case-insensitive by default as case does not matter in domain names
Note that character classes are abbreviations, they need to be used in character groups, i.e., enclosed in `[]`. As such, the equivalent of `[0-9]` would be `[[:digit:]]`, *not* `[:digit:]`. It is allowed to mix character classes with classical character groups. For example, `[a-z0-9]` is identical to `[a-z[:digit:]]`.