This factor reports whether a ranking result’s entire domain name is exactly one digit. It returns a binary 1 or 0, and because the whole domain must match a single digit, essentially every real-world domain scores 0 — including domains that legitimately contain numbers.
| Factor ID | RG-SRP-011 |
|---|---|
| Family | Search Result URL and Snippet |
| Measurement | Binary presence (0 / 1) |
| Measured zone | URL-derived domain |
What it measures
For each result in a measured SERP set, RankGear derives the domain from the result URL and checks a single condition: whether the entire stored domain name is exactly one digit. It is a presence flag, not a count — it does not tally how many numbers appear, or where they appear, inside the domain.
How RankGear measures it
RankGear applies the legacy full-string regular expression \d against the stored domain. Because the match is anchored to the whole string rather than a substring search, the domain has to be a single digit for the factor to return 1. As a result, realistic domains score 0 even when they contain numbers — the pattern never matches a multi-character domain. This behavior intentionally preserves the published legacy math so scores stay comparable across versions.
| Value | Meaning |
|---|---|
| 1 | The entire stored domain is exactly one digit (does not occur for valid real-world domains). |
| 0 | The domain is anything other than a single digit — every normal domain, including ones that contain numbers. |
How to optimize it
Do not change a domain to move this factor. The live, legacy-compatible implementation is effectively constant for valid real-world domains, so it returns 0 regardless of the digits in your domain. Treat it as an observed field in the result set, not a target to chase.
Important considerations
- Despite the display name, this does not search for a number anywhere in a domain — it tests whether the whole domain is a single digit.
- A normal domain that contains digits still returns 0.
- The behavior intentionally preserves published legacy math so historical scores remain comparable.
- Domain decisions should be driven by brand, trust, and migration risk — not by this factor.
- Correlation is not causation: this flag describes a domain characteristic within a measured result set and does not, on its own, move or guarantee a ranking position.
Related factors
Part of the Factors reference · how RankGear measures · glossary.