Function tokenizer

test/unit/marked.test.js:66–76

(src)

        name: 'underline',
        level: 'block',
        tokenizer(src) {
          const rule = /^:([^\n]*)(?:\n|$)/;
          const match = rule.exec(src);
          if (match) {
            return {
              type: 'underline',
              raw: match[0], // This is the text that you want your token to consume from the source
              text: match[1].trim(), // You can add additional properties to your tokens to pass along to the renderer
            };
          }
        },
        renderer(token) {
          return `<u>${token.text}</u>\n`;
        },