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question about bash not returning expected results, the same result as this saved regex returns here

removes port number from URL

Validate 1-223.0-255.0-255.0-255:1-65535

Replace namespaces in xpath with local-name

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Match everything enclosed, say, a phrase, with case insensitive.

(?:https?:\/\/)?(?:www.)?instagram.com\/?([a-zA-Z0-9\.\\-]+)?\/([p]+)?([reel]+)?([tv]+)?([stories]+)?\/([a-zA-Z0-9\-\\.]+)\/?([0-9]+)?

should match any domain with one or more subdomains

Validation of the date of time, taking into account the high year in the format date.ToString("yyMMdd-hh_mm_ss").

Example used in slide 39

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Gets the base ID of the ECTR ID when using copy and paste.

Checks validity of an EA number first two digits 01-12 followed by hyphen then a number from 0-4 and then 4 numbers or uppercase letters and ending in a 1 or 4 for example "05-1J7601". Adding a capital C to the beginning is also accepted "C05-1J7601", along with the entry of 2 X's hyphen and 6 X's ...

Verifying Windows file names (without suffix)

A regular expression of Malaysian phone number I made to be used on a project using flutter.

OIDs are just numbers in the format 1.2.3.4.5.6.7.8.9... Short names are alphanumeric, contiguous descriptions (no spaces, hyphens allowed) Long names can be basically everything (sometimes even UTF-8!) Sometimes, organisations providing the list of 'their' OIDs might reverse the order, for listing...

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custom validation for card name with custom validation. only allow these characters Alphanumeric (A-Z a-z0-9) Special Characters (#&+()/)