This is a regular expression for credit or debit card bank statement lines in Czech:
(Nákup|Kredit|Výběr z bankomatu): (?<merchant>.+), (?<country>\w{2,3}), dne (?<day>[123]?\d).(?<month>1?\d).(?<year>2\d{3}), částka (?<amount>\d+.\d{2})( (?<currency>\w{3}))?
(Nákup|Kredit|Výběr z bankomatu):
is a constant identifying a payment card statement line(?<merchant>.+),
is the merchant provided string (name, address, postal code)- Sometimes, the name and address are separated with two spaces
(?<country>\w{2,3}),
is a two- or three-letter ISO country codedne
is a constant preceeding the date triplet(?<day>[123]?\d).
day number limited to 0-39 to avoid false positives(?<month>1?\d).
month number limited to 0-19 to avoid false positives(?<year>2\d{3})
year number limited to the 2000's to avoid false positives, částka
is a constant preceeding the amount and currency code(?<amount>\d+.\d{2})
is the amount with two decimal places precision(?<currency>\w{3})
is the three letter currency code