Using Regular Expressions – Part 3 of 3 – Examples

21 Jan 2010 3 Comments

Following 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}\b

dd/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}\b

mm/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])\b

yyyy-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}\b

Email 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}\b

Email 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]?)\b

IP 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})?\b

Floating 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:

  1. Using Regular Expressions – Part 2 of 3 – Regex in PHP
  2. Using Regular Expressions – Part 1 of 3 – Overview
  3. Extract and sort email addresses from text files with Automator
  4. Checking your internal and external IP Addresses on a Unix machine
  5. A simpler way to send Text or HTML emails with attachments in PHP
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3 Responses to “Using Regular Expressions – Part 3 of 3 – Examples”

  1. Egon Elbre Reply 21 Jan 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.

  2. Keegan Reply 21 Jan 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+@

  3. willem Reply 21 Jan 2010 at 19:11

    Hey guys

    Good point, thanks!

    I’ve now added that in.

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