This repository contains regular expression (regex) patterns for validating phone numbers postal codes, VAT numbers, dates, currency, credit/debit cards etc. for European countries (but not only).

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Java 正则表达式，语雀浏览链接：https://www.yuque.com/happyflyer/java-topics/agqwvi

My solutions to HackerRank's Java Challenge!

This repository provides the implementation of java core concepts