tinyhumansai/openhuman · error

pattern rule regex is well-formed

Error message

pattern rule regex is well-formed

What it means

Static-invariant panic in pattern_rule(): the PII rule table embeds raw regex pattern strings, and Regex::new expects them to be well-formed. A failure means a developer typo in the pattern literal (unbalanced group, bad escape) at table-build time — not a user-input problem, since no runtime string reaches this constructor.

Source

Thrown at src/openhuman/security/pii/rules.rs:46

}

/// Build a keyword rule: a case-insensitive, word-boundaried alternation over
/// `terms`, all attributed to `category`.
fn keyword_rule(category: PiiCategory, terms: &[&str]) -> Rule {
    let alternation = terms.join("|");
    let pattern = format!(r"(?i)\b(?:{alternation})\b");
    Rule {
        category,
        regex: Regex::new(&pattern).expect("keyword rule regex is well-formed"),
        validator: None,
    }
}

/// Build a pattern rule from a raw regex string.
fn pattern_rule(category: PiiCategory, pattern: &str, validator: Option<fn(&str) -> bool>) -> Rule {
    Rule {
        category,
        regex: Regex::new(pattern).expect("pattern rule regex is well-formed"),
        validator,
    }
}

/// Luhn checksum validation for candidate payment-card numbers. Strips
/// separators first; requires 13–19 digits.
pub(crate) fn is_luhn_valid(raw: &str) -> bool {
    let digits: Vec<u8> = raw
        .bytes()
        .filter(|b| b.is_ascii_digit())
        .map(|b| b - b'0')
        .collect();
    if !(13..=19).contains(&digits.len()) {
        return false;
    }
    let mut sum = 0u32;
    // Double every second digit from the right.
    for (i, &d) in digits.iter().rev().enumerate() {

View on GitHub (pinned to 7491200858)

Solutions

1. Fix the malformed pattern literal in the rule table
2. Cover every pattern with a compile-time test that runs Regex::new over the table
3. Lint pattern literals (clippy's regex checks) to catch drift before release

When it happens

Trigger: Thrown at src/openhuman/security/pii/rules.rs:46 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of tinyhumansai/openhuman@7491200858 (2026-08-17). Data as JSON: /api/errors/bb1b72f6df1800bc. Report an issue: GitHub.