This repository is a collection of regular expressions. There could be multiple regular expressions per requirement.

Please note that, these regular expressions are mainly POSIX compliant (though, few of them may not be).

1. IP Address
2. Credit Card
3. Hex Color Code
4. UUID/GUID
5. Email Address
6. Base64 Encode
7. Date and Time
8. Semantic Version Number
9. Git Commit ID
10. Docker Image ID

1. IPv4: ^([01]?\d\d?<2[0-4]\d<25[0-5])\.([01]?\d\d?<2[0-4]\d<25[0-5])\.([01]?\d\d?<2[0-4]\d<25[0-5])\.([01]?\d\d?<2[0-4]\d<25[0-5])$
2. IPv6: (([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]).){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]).){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))

1. ^(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14}|6(?:011|5[0-9][0-9])[0-9]{12}|3[47][0-9]{13}|3(?:0[0-5]|[68][0-9])[0-9]{11}|(?:2131|1800|35\d{3})\d{11})$ This regex matches Visa, MasterCard, American Express, Diners Club, Discover, and JCB cards.

1. ^#(?:[0-9a-fA-F]{3}){1,2}$
2. ^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})$

1. ^[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}$
2. /^[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}$/i This one is implied regex, and seems that this one is better than regex no. 1.

1. ^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$

1. [^-A-Za-z0-9+/=]|=[^=]|={3,}$
2. ^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=)?$

1. ^(0?[1-9]|[12][0-9]|3[01])[\/\-\.](0?[1-9]|1[012])[\/\-\.](\d{4})\s([0-1][0-9]|[2][0-3])\-([0-5][0-9])\-([0-5][0-9])$

1. ^([0-9]+\\.)?([0-9]+\\.)?(\\*|[0-9]+)$

1. /\b([a-f0-9]{40})\b/

1. ^([A-Fa-f0-9]{12}|[A-Fa-f0-9]{64})$