Regex Tester & Validator

This regex attempts to locate Swiss (CH) International Bank Account Numbers (IBANs) within a larger body of text. It matches the 'CH' country code, two check digits, and five blocks of characters separated by spaces. Note that the expression contains syntax anomalies with unescaped brackets (e.g., `[[0-9]`), causing it to match literal open brackets or digits instead of strictly numbers.