yaak-mountain-loop/plugins/template-function-regex/src/index.ts

import type { CallTemplateFunctionArgs, Context, PluginDefinition } from '@yaakapp/api';

export const plugin: PluginDefinition = {
  templateFunctions: [
    {
      name: 'regex.match',
      description: 'Extract',
      args: [
        {
          type: 'text',
          name: 'regex',
          label: 'Regular Expression',
          placeholder: '^\\w+=(?<value>\\w*)$',
          defaultValue: '^(.*)$',
          description:
            'A JavaScript regular expression, evaluated using the Node.js RegExp engine. Capture groups or named groups can be used to extract values.',
        },
        { type: 'text', name: 'input', label: 'Input Text', multiLine: true },
      ],
      async onRender(_ctx: Context, args: CallTemplateFunctionArgs): Promise<string | null> {
        if (!args.values.regex || !args.values.input) return '';

        const input = String(args.values.input);
        const regex = new RegExp(String(args.values.regex));
        const match = input.match(regex);
        return match?.groups
          ? (Object.values(match.groups)[0] ?? '')
          : (match?.[1] ?? match?.[0] ?? '');
      },
    },
  ],
};