## Syntax ```mermaid %%{init: { 'theme': 'base', 'flowchart': { 'padding': '7', 'nodeSpacing': '20', 'rankSpacing': '20' }, 'themeVariables': { 'fontSize': '11px', 'fontFamily': 'Arial' } }}%% flowchart LR Start((START)) --> IS_EMAIL[IS_EMAIL]:::quoted is_email -->| | IS_EMAIL IS_EMAIL --> End((END)) ``` ## Purpose The `IS_EMAIL` SQL function valuates to boolean true when the value provided is a valid email address according to RFC 822. Parameters: - Email: email address. - Allow plus sign: indicator whether the use of a plus sign ('+') to introduce an alias is allowed (defaults to false). - Check TLD: indicator whether the TLD of the domain name must be validated against the current list (defaults to true). Returns: True when the value provided is a valid email address.