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Email address @ sign validation
According to the Internet specification RFC 2822, an email address must have a single "@" sign. For example, john@host.net is a valid email address. There should be at least one character before the "@" sign, but the total number of characters before the "@" sign should not be more than 64. There sh... 2016-06-23, 3249👍, 0💬

Detecting missing closing parenthesis in program code
How to detect missing closing parenthesis in program code using regular expression? For example, I have the following program code: n = - (LN(1-(B/m)*(r/q))/LN(1+(r/q)) ;Can anyone help? 2013-01-29, 3248👍, 0💬

Capturing request protocol from Apache Web log file
How to capture the request protocol from Apache Web log file? Here are some Apache Web log file entries:127.0.0.1 - frank [10/May/2012:13:55:36 -0700] "GET /apache_pb.gif HTTP/1.0" 200 2326 "-" "-" "-" 213.135.131.79 - - [13/May/2012:17:35:32 -0600] "POST /submit.jsp HTTP/1.0" 200 2326 "-" "-" "SID=... 2013-02-04, 3192👍, 0💬

Capturing Yahoo! Slurp entries from Apache Web log file
How to capture the Yahoo! Slurp from Web log file? Here are some Web log file entries:127.0.0.1 - frank [10/May/2012:13:55:36 -0700] "GET /apache_pb.gif HTTP/1.0" 200 2326 "-" "Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ ysearch/slurp)""-" 213.135.131.79 - - [13/May/2012:17... 2013-02-04, 3112👍, 0💬

Capturing request method from Apache Web log file
How to capture the request method from Apache Web log file? Here are some Apache Web log file entries:127.0.0.1 - frank [10/May/2012:13:55:36 -0700] "GET /apache_pb.gif HTTP/1.0" 200 2326 "-" "-" "-" 213.135.131.79 - - [13/May/2012:17:35:32 -0600] "POST /submit.jsp HTTP/1.0" 200 2326 "-" "-" "SID=10... 2013-02-04, 3111👍, 0💬

RegexMagic: Regular Expression Generator
What is RegexMagic? RegexMagic makes creating regular expressions easier than ever. While other regex tools such as RegexBuddy merely make it easier to work with regular expressions, with RegexMagic you don't have to deal with the regular expression syntax at all. RegexMagic generates complete regul... 2013-02-01, 3106👍, 0💬

Capturing request path from Apache Web log file
How to capture the request path from Apache Web log file? Here are some Apache Web log file entries:127.0.0.1 - frank [10/May/2012:13:55:36 -0700] "GET /apache_pb.gif HTTP/1.0" 200 2326 "-" "-" "-" 213.135.131.79 - - [13/May/2012:17:35:32 -0600] "POST /submit.jsp HTTP/1.0" 200 2326 "-" "-" "SID=1000... 2013-02-04, 3063👍, 0💬

Using negative character class [^...]
What is a negative character class? How to specify a negative character class in a regular expression? How to use negative character class to capture words that contains no vowel letters in this lyrics: Daddy started out in San Francisco, Tootin' on his trumpet loud and mean, Suddenly a voice said, ... 2013-02-02, 2979👍, 0💬

Capturing response status code from Apache Web log file
How to capture the response status code from Apache Web log file? Here are some Apache Web log file entries:127.0.0.1 - frank [10/May/2012:13:55:36 -0700] "GET /apache_pb.gif HTTP/1.0" 200 2326 "-" "-" "-" 213.135.131.79 - - [13/May/2012:17:35:32 -0600] "POST /submit.jsp HTTP/1.0" 200 2326 "-" "-" "... 2013-02-04, 2962👍, 0💬

Capturing timestamp from Apache Web log file
How to capture the timestamp from Apache Web log file? Here are some Apache Web log file entries:127.0.0.1 - frank [10/May/2012:13:55:36 -0700] "GET /apache_pb.gif HTTP/1.0" 200 2326 "-" "-" "-" 213.135.131.79 - - [15/May/2012:19:21:49 -0400] "GET /features.htm HTTP/1.1" 200 9955 "http://www.abc.com... 2013-02-03, 2835👍, 0💬

Capturing response message size from Apache Web log file
How to capture the response message size from Apache Web log file? Here are some Apache Web log file entries:127.0.0.1 - frank [10/May/2012:13:55:36 -0700] "GET /apache_pb.gif HTTP/1.0" 200 2326 "-" "-" "-" 213.135.131.79 - - [13/May/2012:17:35:32 -0600] "POST /submit.jsp HTTP/1.0" 200 1024 "-" "-" ... 2013-02-04, 2825👍, 0💬

Positive look-behind assertion (?&lt;=...)
What is a positive look-behind assertion? How to use it? How to write a regular expression to find words ending with 'oo' in text like: how, too, bamboo, school,? A positive look-behind assertion is a zero-width assertion that allows you to match a subpattern left to the current position (look-behin... 2013-01-31, 2816👍, 0💬

Backreferences \g1, \g2, ...
What is a backreference? How to use a backreference? How to write a regular expression using a backreferences to capture 5-letter reversible words in a text string like this: civic, level, radar, rotor or stats? Backreferences are references representing catured sub strings already matched in earlie... 2013-01-23, 2764👍, 0💬

Escape sequence - Carriage Return character \r
What is the escape sequence for the Carriage Return character? On Unix systems, a line break is a single New Line character. But on Windows systems, a line break is a Carriage Return character followed by a New Line character. How to write a regular expression to capture line breaks for both systems... 2013-01-26, 2760👍, 0💬

Parsing directory entries from Windows "dir" command
How to write a regular expression to parse sub directory entries from the output of Windows "dir" command? Here is an example output of the "dir" command:Directory of C:\Windows 12/15/2012 09:24 AM . 12/15/2012 09:24 AM .. 07/13/2009 11:52 PM addins 01/19/2012 10:48 AM AppCompat 11/29/2012 09:16 AM ... 2013-02-01, 2729👍, 0💬

Capturing path name from URL
How to capture path name from URL addresses with a regular expression? Here are URL address examples:ftp://ftp.example.org /https://login.example.com:5800 /?mode=guesthttp://www.google.com:80/api/e xample/submit.php?name=joe#newfile://localhost/c|/WINDOWS/do cument.html#chapter1URL addresses are wri... 2013-02-03, 2711👍, 0💬

Escape sequence - Character in hexadecimal \x.. \x{..}
What is the escape sequence for a character written in hexadecimal format? How to write a regular expression to capture the escape (Backslash) \ character in a string like: \x5C The escape sequence for any character in hexadecimal format is '\x..' or \x{..}, '..' is the 2 hexadecimal digits. For exa... 2013-01-26, 2706👍, 0💬

regex.larsolavtorvik.com
What functions are offered by regex.larsolavtorvik.com? regex.larsolavtorvik.com is a regular expression online testing tool with PHP PCRE, PHP POSIX, JavaScript engines. regex.larsolavtorvik.com 2013-01-25, 2693👍, 0💬

regexpal.com
What functions are offered by regexpal.com? regexpal.com is a JavaScript regular expression tester. regexpal.com 2013-01-25, 2661👍, 0💬

RegExLib.com
What resources are offered at RegExLib.com? RegExLib.com is the Internet's first Regular Expression Library, which indexed 3602 expressions from 2066 contributors around the world. RegExLib.com 2013-01-25, 2657👍, 0💬

Escape sequence - Character in octal \... \o{...}
What is the escape sequence for a character written in octal format? How to write a regular expression to capture the escape (Backslash) \ character in a string like: \x5C The escape sequence for any character in octal number format is '\...' or \o{...}, '...' is the 3 octal digits. For example: \06... 2013-01-26, 2640👍, 0💬

Using character class [...]
What is a character class? How to specify a character class in a regular expression? How to write a regular expression using character classes to capture 7 digits phone numbers from this example string "123-4567, 123 4567 or 1234567"? A character class allows a set of possible characters, rather tha... 2013-02-02, 2628👍, 0💬

Negative look-behind assertion (?&lt;!...)
What is a negative look-behind assertion? How to use it? How to write a regular expression to find words not ending with 'oo' in text like: how, too, bamboo, school,? A negative look-behind assertion is a zero-width assertion that allows you to not match a subpattern left to the current position (lo... 2013-01-31, 2609👍, 0💬

Expresso editor
What functions are offered by Expresso editor? The award-winning Expresso editor is equally suitable as a teaching tool for the beginning user of regular expressions or as a full-featured development environment for the experienced programmer or web designer with an extensive knowledge of regular ex... 2013-01-25, 2552👍, 0💬

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Example General Resource Tools