30 Regex

Code notes & tips

2018-07-21

regex

Password Strength

1	^(?=.[A-Z].[A-Z])(?=.[!@#$&])(?=.[0-9].[0-9])(?=.[a-z].[a-z].*[a-z]).{8}$

Hexadecimal Color

1	\#([a-fA-F]\|[0-9]){3, 6}

Validate E-mail Address

1	/[A-Z0-9._%+-]+@[A-Z0-9-]+.+.[A-Z]{2,4}/igm

IPv4 Address

1	/\b(?:(?:25[0-5]\|2[0-4][0-9]\|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]\|2[0-4][0-9]\|[01]?[0-9][0-9]?)\b/

IPv6 Address

(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))

Thousands Separator

1	/\d{1,3}(?=(\d{3})+(?!\d))/g

Prepend HTTP to Hyperlink

1
2
3

if (!s.match(/^[a-zA-Z]+:\/\//)){
    s = 'http://' + s;
}

Pull Domain from URL

1	/https?:\/\/(?:[-\w]+\.)?([-\w]+)\.\w+(?:\.\w+)?\/?.*/i

Sort Keywords by Word Count

^[^\s]*$      matches exactly 1-word keyword
^[^\s]*\s[^\s]*$    matches exactly 2-word keyword
^[^\s]*\s[^\s]*     matches keywords of at least 2 words (2 and more)
^([^\s]*\s){2}[^\s]*$    matches exactly 3-word keyword
^([^\s]*\s){4}[^\s]*$    matches 5-words-and-more keywords (longtail)

Find a Valid Base64 String in PHP

1	\?php[ \t]eval$base64_decode\(\'(([A-Za-z0-9+/]{4})*([A-Za-z0-9+/]{3}=\|[A-Za-z0-9+/]{2}==)?){1}\'$\)\;

Valid Phone Number

1	^\+?\d{1,3}?[- .]?$?(?:\d{2,3})$?[- .]?\d\d\d[- .]?\d\d\d\d$

Leading & Trailing Whitespace

1	^[ \s]+\|[ \s]+$

Pull Image Source

1	\< [img][^\>][src] = [\"\']{0,1}([^\"\'\ >]*)

Validate Date in DD/MM/YYYY Format

^(?:(?:31(\/|-|\.)(?:0?[13578]|1[02]))\1|(?:(?:29|30)(\/|-|\.)(?:0?[1,3-9]|1[0-2])\2))(?:(?:1[6-9]|[2-9]\d)?\d{2})$|^(?:29(\/|-|\.)0?2\3(?:(?:(?:1[6-9]|[2-9]\d)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00))))$|^(?:0?[1-9]|1\d|2[0-8])(\/|-|\.)(?:(?:0?[1-9])|(?:1[0-2]))\4(?:(?:1[6-9]|[2-9]\d)?\d{2})$

YouTube Video ID Match

1	/http:\/\/(?:youtu\.be\/\|(?:[a-z]{2,3}\.)?youtube\.com\/watch(?:\?\|#\!)v=)([\w-]{11}).*/gi

Valid ISBN

1	/\b(?:ISBN(?:: ?\| ))?((?:97[89])?\d{9}[\dx])\b/i

Check Zip Code

1	^\d{5}(?:[-\s]\d{4})?$

Valid Twitter Username

1	/@([A-Za-z0-9_]{1,15})/

Credit Card Numbers

1	^(?:4[0-9]{12}(?:[0-9]{3})?\|5[1-5][0-9]{14}\|6(?:011\|5[0-9][0-9])[0-9]{12}\|3[47][0-9]{13}\|3(?:0[0-5]\|[68][0-9])[0-9]{11}\|(?:2131\|1800\|35\d{3})\d{11})$

Find CSS Attributes

1	^\s[a-zA-Z\-]+\s[:]{1}\s[a-zA-Z0-9\s.#]+[;]{1}

Strip HTML Comments

1	<!--(.*?)-->

Facebook Profile URL

1	/(?:http:\/\/)?(?:www\.)?facebook\.com\/(?:(?:\w)#!\/)?(?:pages\/)?(?:[\w\-]\/)([\w\-])/

Check version of Internet Explorer

1	^.MSIE [5-8](?:\.[0-9]+)?(?!.Trident\/[5-9]\.0).*$

Extract Price

1	/(\$[0-9,]+(\.[0-9]{2})?)/

Parse E-mail Header

1	/\b[A-Z0-9._%+-]+@(?:[A-Z0-9-]+\.)+[A-Z]{2,6}\b/i

Match a Particular Filetype

1	/^(.\.(?!(htm\|html\|class\|js)$))?[^.]$/i

Match a URL String

1	/[-a-zA-Z0-9@:%_\+.~#?&//=]{2,256}\.[a-z]{2,4}\b(\/[-a-zA-Z0-9@:%_\+.~#?&//=]*)?/gi

Append rel=”nofollow” to Links

1	(<a\s(?!.\brel=)[^>])(href="https?://)((?!(?:(?:www\.)?'.implode('\|(?:www\.)?', $follow_list).'))[^"]+)"((?!.\brel=)[^>])(?:[^>])>

Media Query Match

1	/@media([^{]+)\{([\s\S]+?})\s*}/g

Google Search Syntax

1	/([+-]?(?:'.+?'\|".+?"\|[^+\- ]{1}[^ ]*))/g

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