51 services carry this tag in their source record. Tags come from the provider, not from us — a tag is a claim about what the service does, not proof that it does it well.
Validate a isbn 10: tests the value against a well-known isbn 10 pattern and returns valid true/false, the pattern used (so you can reuse it), and, when it fails, the first character position that breaks the rule. Format...
How many <input> elements does the page have? Fetches the URL and counts input tags (plus, where relevant, how many have alt/src/href/type attributes), and the page's total element count for scale. Structural audits and...
Validate a email: tests the value against a well-known email pattern and returns valid true/false, the pattern used (so you can reuse it), and, when it fails, the first character position that breaks the rule. Format val...
Validate a url: tests the value against a well-known url pattern and returns valid true/false, the pattern used (so you can reuse it), and, when it fails, the first character position that breaks the rule. Format validat...
Validate a ipv4: tests the value against a well-known ipv4 pattern and returns valid true/false, the pattern used (so you can reuse it), and, when it fails, the first character position that breaks the rule. Format valid...
Validate a ipv6: tests the value against a well-known ipv6 pattern and returns valid true/false, the pattern used (so you can reuse it), and, when it fails, the first character position that breaks the rule. Format valid...
Validate a uuid v4: tests the value against a well-known uuid v4 pattern and returns valid true/false, the pattern used (so you can reuse it), and, when it fails, the first character position that breaks the rule. Format...
Validate a hex color: tests the value against a well-known hex color pattern and returns valid true/false, the pattern used (so you can reuse it), and, when it fails, the first character position that breaks the rule. Fo...
Validate a iso date: tests the value against a well-known iso date pattern and returns valid true/false, the pattern used (so you can reuse it), and, when it fails, the first character position that breaks the rule. Form...
Validate a iso datetime: tests the value against a well-known iso datetime pattern and returns valid true/false, the pattern used (so you can reuse it), and, when it fails, the first character position that breaks the ru...
Validate a time 24h: tests the value against a well-known time 24h pattern and returns valid true/false, the pattern used (so you can reuse it), and, when it fails, the first character position that breaks the rule. Form...
Validate a phone e164: tests the value against a well-known phone e164 pattern and returns valid true/false, the pattern used (so you can reuse it), and, when it fails, the first character position that breaks the rule....
Validate a phone north america: tests the value against a well-known phone north america pattern and returns valid true/false, the pattern used (so you can reuse it), and, when it fails, the first character position that...
Validate a zip us: tests the value against a well-known zip us pattern and returns valid true/false, the pattern used (so you can reuse it), and, when it fails, the first character position that breaks the rule. Format v...
Validate a postal ca: tests the value against a well-known postal ca pattern and returns valid true/false, the pattern used (so you can reuse it), and, when it fails, the first character position that breaks the rule. Fo...
Validate a postcode uk: tests the value against a well-known postcode uk pattern and returns valid true/false, the pattern used (so you can reuse it), and, when it fails, the first character position that breaks the rule...
Validate a credit card: tests the value against a well-known credit card pattern and returns valid true/false, the pattern used (so you can reuse it), and, when it fails, the first character position that breaks the rule...
Validate a iban: tests the value against a well-known iban pattern and returns valid true/false, the pattern used (so you can reuse it), and, when it fails, the first character position that breaks the rule. Format valid...
Validate a bitcoin address: tests the value against a well-known bitcoin address pattern and returns valid true/false, the pattern used (so you can reuse it), and, when it fails, the first character position that breaks...
Validate a ethereum address: tests the value against a well-known ethereum address pattern and returns valid true/false, the pattern used (so you can reuse it), and, when it fails, the first character position that break...
Validate a domain: tests the value against a well-known domain pattern and returns valid true/false, the pattern used (so you can reuse it), and, when it fails, the first character position that breaks the rule. Format v...
Validate a slug: tests the value against a well-known slug pattern and returns valid true/false, the pattern used (so you can reuse it), and, when it fails, the first character position that breaks the rule. Format valid...
Validate a username: tests the value against a well-known username pattern and returns valid true/false, the pattern used (so you can reuse it), and, when it fails, the first character position that breaks the rule. Form...
Validate a strong password: tests the value against a well-known strong password pattern and returns valid true/false, the pattern used (so you can reuse it), and, when it fails, the first character position that breaks...