This simply checks if the string is not empty spaces.

Original credit for this expression goes to: https://emailregex.com/

check the code

This pattern finds a parameter (sst) key + value in a GET request URL. When replaced with an empty string, effectively removes the parameter. Works with both full URLs and isolated query strings. Works in PCRE and PCRE2. Full use case: if (isset($_GET["sst"])) { // validate...

Prepare batch job for opportunity close

Need to FULLY Break Out EVERY Component of a URL? Like, as in "every constituent element individually accessible in its own named capture group?" Need it to be pre-optimized and fully ECMA-compliant? Want to see exhaustive unit tests proving these claims (144 are included; all 144 execute in 6.5ms. ...

Or any other particular case where given any line that starts with the pattern "@apply" (or any other line heading) and it substitutes any word (list of characters without spaces), with or without puntuation in them, and it adds a custom prefix to all the words in that line but the line heading.

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...

This works against a list of hyperlinks from the 'USS Marmora (1862)' article You can include File: pages by removing the File:| from the regex. I could improve how the remaining query for urls containing index.php, for now I recommend splitting in your chosen programming language. ...

A regex to find if a postcode is in Auckland region (New Zealand)

ECMAScript simple regex for email validation

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...

Case insensitive (of course) All words can all be separated by nothing, spaces, periods, slashes, dashes, or underscores. (So "PO Box 123", "P.O. Box 123", "PO-Box 123", "PO_Box123", etc. all match.) Some valid abbreviations are P/Post/Postal, O/Off/Office, and B/Box/Bx/Bin (as well as N/No/Num/Numb...

(.)\/\/(.)

Pattern matching and extracting color code formats using RegEx. https://github.com/Kyza/color-regex/

convert mikrotik rsc to one line as every rule

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

text has numbers

Matches the data sent by the twitch IRC and captures into various groups

By inserting this regex in a programming language to test it against Codeforces 1800A you'll solve the task