Regex Pattern

Regex To Determine If A String Has All Unique Characters

A regular expression that determines if a given string has all unique (none repeating) characters.

/^(?:([A-Za-z])(?!.*\1))*$/g

A regular expression that matches the various names of the days of the week.

/\b(?:Tue(?:sday)?|Wed(?:nesday)?|Thu(?:rsday)?|Sat(?:urday)?|(Mon|Fri|Sun)(?:day)?)/gi

A regular expression to extract a domain name or subdomain (with a protocol like HTTPS, HTTP) from a given URL.

/^(?:https?:\/\/)?(?:[^@\/\n][email protected])?(?:www\.)?([^:\/?\n]+)/

A regular expression that matches month names. Supports both full month names and 3-letter abbreviations.

/\b(?:Jan(?:uary)?|Feb(?:ruary)?|Mar(?:ch)?|Apr(?:il)?|May|Jun(?:e)?|Jul(?:y)?|Aug(?:ust)?|Sep(?:tember)?|Oct(?:ober)?|(Nov|Dec)(?:ember)?)/g

A regular expression that matches multiple Email addresses separated by semicolons in a string.

/(([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)(\s*;\s*|\s*$))*/g

A regular expression to match one URL parameter in query strings. Can be used to filter requests on a specific parameter from the query string.

/&foo(\=[^&]*)?(?=&|$)|^foo(\=[^&]*)?(&|$)/

A regular expression to match repeating digits in a given number.

/([0-9])\1+/g

A regular expression to extract the filename from a given path.

/[ \w-]+\./g

A quick regular expression that matches all content before an underscore(_) in a string.

/^[^_]*_/g

A quick regular expression to match and validate the Credit Card’s CVV numbers.

/^[0-9]{3,4}$/