Not only validates valid date/time, but also the number of days in a month (including leap year), and both Z and UTC offset.

Matching for mikrotik ROS 7 Used in promtail and grafana

Validates that a given string is a number of up to 15 integer digits and up to 2 decimal digits. Group separators could be either comma or space class but can't be mixed. Decimal separator could be either comma (if comma was not a group delimiter) or dot. This variation uses small captures for mode...

POSIX ERE compatible, suitable for usage in Bash [ testing Attributions Derived from [regex101: RFC1918 - Private IPv4 addresses by 0100101101001.

https://docs.microsoft.com/en-us/windows/win32/fileio/naming-a-file Integer value zero, sometimes referred to as the ASCII NUL character. Characters whose integer representations are in the range from 1 through 31, except for alternate data streams where these characters are allowed. For more info...

Regular expression to check the email syntax validity. Certainly requires improvement, but it's a good basis to work from. Work with Java and JavaScript.

CRON validation Validates CRON pattern (Quartz) and supports groups. Useful for e.g. typescript or other typed languages. The following greoups are covered: second...

this is some cursed shit, but it does work. I use it to check whether all my ROMs have valid names or not. Makes it easier to read and, more importantly, deduplicate.

Test your RSS pubDate has a correctly formatted date value according to the RFC822 standard It will match timeZoneName (eg GMT, EST) or time zone offset (eg. +0100)

This was build on gentoo with english_ca.utf8 IIRC. Might not work for other distros... or locales supports -as the delimiter of hostname suffixing/prefixing

This is the best regex I found that was able to correctly parse cells containing multiple lines (hard line breaks). Low number of steps with sufficient speed, and it doesn't require /x option either. Source: https://gist.github.com/awwsmm/886ac0ce0cef517ad7092915f708175f

uncode word boundaries

thanks

\tilde \alpha

test

Supports parameters such as keys and values, also parameters enclosed in quotes.

A regular expression for extracting the author, repository name, and optional branch from a GitHub repository or tree URL. Handles both HTTP(S) and direct GitHub links.

Check if a string contains the word word in it (case insensitive). If you have no idea, I guess you could try /word/.

Only match lines with the text start, unless text end appears prior to start. Note: end may or may not be in the string. Match start line_end; and don't match line_end; start

I'd like to know if a text contains words with 4 characters or more which are repeated 3 or more times in the text (anywhere in the text). If so, set one (and only one) backreference for each word.