/((20)[0-9]{2}-|1[02])-|12|3[01]))|((20)[0-9]{2}-|11)-|12|30))|((20)[0-9]{2}--|1[0-9]|2[0-8]))|((((20)(04|08|2468|13579))|2000)-[-]29)/g

Example: Find the digit that repeats three times in a row in "451999277". Regex: "(\d)\1\1" (\d) - capture group for the digit and first occurrence \1 - matches one more consecutive occurrence of captured digit

Match full SSN

This little regex is taking an email and creating 2 group first is for before the @ sign and the second is for after the @ sign

Exclude certain tags with OR

123 456 7890 (123) 456 7890 (123) 456-7890 1234567890 123 456 7890 123 4567890...

A well-documented, easy to modify bulletproof regular expression that matches complete URLs or URL components. Components include: Schema scheme/protocol**: use an OR statement to add FTP, etc....

This is a number also 123-456-7890 This is not a number: 123456 This is not a number, but an address 123 456 My parameters are 90/60/90 - 120/150/120 - not a phone number I am cheeky and I use letter 0 instead of zero 604_213_0293 Or I use | symbol and also 604_2|3_0293 may happen...

https://www.php-fig.org/psr/psr-16/ Key - A string of at least one character that uniquely identifies a cached item. Implementing libraries MUST support keys consisting of the characters A-Z, a-z, 0-9, _, and . in any order in UTF-8 encoding and a length of up to 64 characters. Implementing libr...