text/x-rust
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662 B
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19 lines
/// Ensures a slug-like value only includes safe URL characters.
/// Allowed: lowercase ASCII letters, digits, dash, underscore, period (not leading).
pub fn validate_slug(value: &str) -> Result<(), &'static str> {
if value.len() < 3 {
return Err("Value must be at least 3 characters.");
}
if value.starts_with('.') {
return Err("Value cannot start with a period.");
}
if value.chars().all(|ch| {
ch.is_ascii_lowercase() || ch.is_ascii_digit() || matches!(ch, '-' | '_' | '.')
}) {
Ok(())
} else {
Err("Only lowercase letters, numbers, dashes, underscores, and periods are allowed.")
}
}
