Using Regular Expressions - Part 3 of 3 - Examples
Author: willem In: bash scripting, coding, javascript, php, productivity, python, toolsFollowing on Geekology’s previous posts on Regular expressions (Regex Overview and Regex in PHP), the following is a list of regular expression examples for general use.
Credit Cards:
All major credit cards:
^(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14}|6011[0-9]{12}|3(?:0[0-5]|[68][0-9])[0-9]{11}|3[47][0-9]{13})$American Express:
^3[47][0-9]{13}$Diners Club International:
^3(?:0[0-5]|[68][0-9])[0-9]{11}$Discover:
^6011[0-9]{12}$MasterCard:
^5[1-5][0-9]{14}$Visa:
^4[0-9]{12}(?:[0-9]{3})?$Dates:
d/m/yy or dd/mm/yyyy:
\b(0?[1-9]|[12][0-9]|3[01])[- /.](0?[1-9]|1[012])[- /.](19|20)?[0-9]{2}\bdd/mm/yyyy:
(0[1-9]|[12][0-9]|3[01])[- /.](0[1-9]|1[012])[- /.](19|20)[0-9]{2}m/d/y or mm/dd/yyyy:
\b(0?[1-9]|1[012])[- /.](0?[1-9]|[12][0-9]|3[01])[- /.](19|20)?[0-9]{2}\bmm/dd/yyyy:
(0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])[- /.](19|20)[0-9]{2}yy-m-d or yyyy-mm-dd:
\b(19|20)?[0-9]{2}[- /.](0?[1-9]|1[012])[- /.](0?[1-9]|[12][0-9]|3[01])\byyyy-mm-dd:
(19|20)[0-9]{2}[- /.](0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])Email Addresses:
Email Address:
\b[A-Z0-9._%-+]+@[A-Z0-9.-]+\.[A-Z]{2,4}\bEmail Address (anchored):
^[A-Z0-9._%-+]+@[A-Z0-9.-]+\.[A-Z]{2,4}$Email Address (anchored, no consecutive dots):
^[A-Z0-9._%-+]+@(?:[A-Z0-9-]+\.)+[A-Z]{2,4}$Email Address (no consecutive dots):
\b[A-Z0-9._%-+]+@(?:[A-Z0-9-]+\.)+[A-Z]{2,4}\bEmail Address (specific TLDs):
^[A-Z0-9._%-+]+@[A-Z0-9.-]+\.(?:[A-Z]{2}|com|org|net|biz|info|name|aero|biz|info|jobs|museum|name)$HTML:
HTML Comment:
<!--.*?-->
HTML File:
.*?.*?.*?.*?.*?]*>.*?.*?
HTML File (atomic):
(?>.*?)(?>.*?)(?>.*?)(?>.*?)(?>.*?]*>)(?>.*?).*?
HTML Tag:
<([A-Z][A-Z0-9]*)[^>]*>(.*?)<!--\1-->
HTML Tag (without contents):
<!--?[a-z][a-z0-9]*[^<-->]*>
IP Addresses:
IP Addresses:
\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]?)\bIP Addresses (stored in capturing group):
\b(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b
Logs:
Apache HTML Hits:
^((?#client IP or domain name)\S+)\s+((?#basic authentication)\S+\s+\S+)\s+\[((?#date and time)[^]]+)\]\s+"(?:GET|POST|HEAD) ((?#file)/[^ ?"]+?\.html?)\??((?#parameters)[^ ?"]+)? HTTP/[0-9.]+"\s+(?#status code)200\s+((?#bytes transferred)[-0-9]+)\s+"((?#referrer)[^"]*)"\s+"((?#user agent)[^"]*)"$
Apache 404 Errors:
^((?#client IP or domain name)\S+)\s+((?#basic authentication)\S+\s+\S+)\s+\[((?#date and time)[^]]+)\]\s+"(?:GET|POST|HEAD) ((?#file)[^ ?"]+)\??((?#parameters)[^ ?"]+)? HTTP/[0-9.]+"\s+(?#status code)404\s+((?#bytes transferred)[-0-9]+)\s+"((?#referrer)[^"]*)"\s+"((?#user agent)[^"]*)"$
Numbers:
Currency Amount:
\b[0-9]{1,3}(?:,?[0-9]{3})*(?:\.[0-9]{2})?\bFloating Point:
[-+]?\b[0-9]*\.?[0-9]+\b
Hexadecimal:
\b0[xX][0-9a-fA-F]+\b
Programming:
Comment (#):
#.*$
Comment (//):
//.*$
Comment (/* */):
/\*.*?\*/
URLs:
Slug:
/^[a-z0-9-]+$/
URL:
/^(https?:\/\/)?([\da-z\.-]+)\.([a-z\.]{2,6})([\/\w \.-]*)*\/?$/
Related posts:
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Egon Elbre
January 21st, 2010 at 15:07
Those email regex-s don’t allow subaddressing (that means “address+subaddress@mail.com”). Subaddressing is one really good feature - so you have disposable emails. I’m always frustrated when I want to use and can’t.
It also gives feedback where did the email leak to spammers.
Keegan
January 21st, 2010 at 17:09
Your email regex is too restrictive, there are valid email addresses which it won’t match. I’d normally use a more permissive part for the bit before @ such as \S+@
willem
January 21st, 2010 at 19:11
Hey guys
Good point, thanks!
I’ve now added that in.