The most commonly used (and most wanted) regexes
UPDATE 6/2022: See further explanations/answers in story responses!
After some time I thought about publishing this article ([see my previous tutorial][1]) with the regex I used most in the projects on which I was involved.
Write in the comments any regex that you would like to add and I will try (if I can) to implement them 😅
Happy coding!!!
Alpha-numeric, literals, digits, lowercase, uppercase chars only
\w //alpha-numeric only[a-zA-Z] //literals only\d //digits only[a-z] //lowercase literal only[A-Z] //uppercase literal only
Simple numbers — [try it!][2]
Matches simple numbers only (no decimal nor fractions)
^(\d+)$. 15/12 8.5 12
Decimal numbers — [try it!][3]
^(\d*)[.,](\d+)$ 15/12 8.5 12 8,7
Fractions — [try it!][4]
^(\d+)[\/](\d+)$ 15/12 8.5 12
Alphanumeric without spaces — [try it!][5]
^(\w*)$ hello123 but not this text
Alphanumeric with spaces — [try it!][6]
^(\w*)$ hello123 this text but not this!
Email (simple — see advanced section for more)
Classic email — [try it!][7]
^([a-zA-Z0-9._%-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,6})*$ jonny.fox@factorymind.com hello@sdasdad.hello but not this!
Email tokens — [try it!][8]
^([a-z0-9_\.\+-]+)@([\da-z\.-]+)\.([a-z\.]{2,6})$
Advanced Regex
Trim spaces — [try it!][9]
Matches text avoiding additional spaces
^[\s]*(.*?)[\s]*$
HTML Tag — [try it!][10]
Matches any valid HTML tag and the corresponding closing tag
<([a-z]+)([^<]+)*(?:>(.*)<\/\1>|\s+\/>)
Hexadecimal value — [try it!][11]
Matches any valid hex color inside text
\B#(?:[a-fA-F0–9]{6}|[a-fA-F0–9]{3})\b
Valid email (RFC5322) — [try it!][12]
Matches any valid email inside text
\b[\w.!#$%&’*+\/=?^`{|}~-]+@[\w-]+(?:\.[\w-]+)*\b
Username (simple) — [try it!][13]
Minimum length of 3, maximum length of 16, composed by letters, numbers or dashes.
/^[a-z0-9_-]{3,16}$/
Strong password — [try it!][14]
Minimum length of 6, at least 1 uppercase letter, at least 1 lowercase letter, at least 1 number, at least 1 special character
(?=^.{6,}$)((?=.*\w)(?=.*[A-Z])(?=.*[a-z])(?=.*[0-9])(?=.*[|!"$%&\/\(\)\?\^\'\\\+\-\*]))^.*
2 of a kind — [try it!][15]
At least 2 letters (uppercase or lowercase) at any index, minimum length of 8, maximum length of 32
^(?=([0-9]*[a-z]){2,})([a-zA-Z0-9]{8,32})$
URL tokenization— [try it!][16]
If you want to use capturing groups to get scheme, path, etc. (or add user-info, host, port…) feel free to ask it in comments!
^(((https?|ftp):\/\/)?([\w\-\.])+(\.)([\w]){2,4}([\w\/+=%&_\.~?\-]*))*$
IPv4 address — [try it!][17]
Matches any valid IPv4 address inside text
\b(?:(?:25[0-5]|2[0-4]\d|[01]?\d\d?)\.){3}(?:25[0-5]|2[0-4]\d|[01]?\d\d?)\b
URL or IPv4 address — [try it!][18]
^(((h..ps?|f.p):\/\/)?(?:([\w\-\.])+(\[?\.\]?)([\w]){2,4}|(?:(?:25[0–5]|2[0–4]\d|[01]?\d\d?)\[?\.\]?){3}(?:25[0–5]|2[0–4]\d|[01]?\d\d?)))*([\w\/+=%&_\.~?\-]*)$
SSN — Social Security Number (simple) — [try it!][19]
If you want to check the [validity of an SSN][20] feel free to ask in comments!
^((?<area>[\d]{3})[-][\d]{2}[-][\d]{4})$