Example General Resource Tools

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JRegexpTester
What functions are offered by JRegexpTester? JRegexpTester is a standalone Swing application that helps you test regular expressions with the Sun Java standard API (java.util.regex). The extracted data can be modified with formatters similar to those used by sprintf, or with standard Java date and d... 2013-01-25, ∼4345🔥, 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.co... 2013-02-03, ∼4339🔥, 0💬

Multiple line modifier - m
What is the multiple line modifier? How to use it? How the multiple line modifier can be used on this example text: 06/10/2009 04:21 PM 69,584 avicap.dll 06/10/2009 04:21 PM 109,456 avifile.dll 07/13/2009 04:41 PM 32,816 COMMDLG.DLL 07/13/2009 04:41 PM 2,000 keyboard.drv 06/10/2009 04:42 PM 9,936 lz... 2013-02-02, ∼4298🔥, 0💬

Negative look-behind assertion (?<!...)
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 (l... 2013-01-31, ∼4244🔥, 0💬

US phone number validation
How to perform a validation on US phone numbers using a regular expression? For example, " (021)423-2323 " is an valid US phone number. To perform a validation on US phone numbers, try this regular expression: ^\(?\d{3}\)?[-\s.]?\d{3}[-\s.] \d{4}$ 2013-01-27, ∼4186🔥, 0💬

Negative look-ahead assertion (?!...)
What is a negative look-ahead assertion? How to use it? How to write a regular expression to find words without 'oo' in text like: how, to, look, google, school ? A negative look-ahead assertion is a zero-width assertion that allows you to not match a subpattern beyond the current position (look-ahe... 2013-01-26, ∼4162🔥, 0💬

Capturing fragment id from URL
How to capture fragment id from URL addresses with a regular expression? Here are URL address examples: ftp://ftp.example.org/ https://login.example.com:5800 /?mode=guest&lang=enhttp://www.google.com:80/api/e xample/submit.php?name=joe#newfile://localhost/c|/WINDOWS/do cument.html#chapter1URL ad... 2013-02-03, ∼4099🔥, 0💬

Capturing query string from URL
How to capture query string from URL addresses with a regular expression? Here are URL address examples: ftp://ftp.example.org/ https://login.example.com:5800 /?mode=guest&lang=enhttp://www.google.com:80/api/e xample/submit.php?name=joe#newfile://localhost/c|/WINDOWS/do cument.html#chapter1URL a... 2013-02-03, ∼4074🔥, 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 wr... 2013-02-03, ∼4035🔥, 0💬

Capturing user agent from Apache Web log file
How to capture the user agent 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 "-" "-" "SID=1000;... 2013-02-04, ∼3996🔥, 0💬

Capturing scheme name from URL
How to capture scheme name from URL addresses with a regular expression? Here are URL address examples: ftp://asmith@ftp.example.org https://login.example.com:5800 /http://en.wikipedia.org/wiki/W WW.html#Historyfile://localhost/c|/WINDOWS/cl ock.aviURL addresses are written in this format: scheme://... 2013-02-03, ∼3971🔥, 0💬

None capturing group (?:...)
Is there any to stop capturing a group to improve matching performance? How to write a possessive quantified subpattern to match double-quoted strings like this: "He said: \“Hello!\”" ? Yes. To turn the default capturing behavior on a group, you can entered '?:' at the beginning of the group a... 2013-01-26, ∼3952🔥, 0💬

Case insensitive modifier - i
What is case insensitive modifier? How to use it? How to write a regular expression to capture the "DIM" key word from this code example: Dim intArray(10, 10, 10) As Integer ReDim Preserve intArray(10, 10, 20) ReDIM Preserve intArray(10, 10, 15) Redim intArray(10, 10, 10) The regular expression to c... 2013-02-03, ∼3937🔥, 0💬

Using multiple lines and single line modifiers together - ms
What happens if I use multiple lines modifier, m, and single line modifier, s, together? How to write a regular expression to capture each bullet statement from this sample text: - The DAEMON or VENDOR label. - If the path is missing or incorrect, the product placed in the same directory as the x da... 2013-02-02, ∼3925🔥, 0💬

Capturing referer URL from Apache Web log file
How to capture the referer URL 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 "-" "-" "SID=1000... 2013-02-04, ∼3886🔥, 0💬

Validating Complexity and Length of Passwords
How to write a regular expression to check the complexity and length of passwords with the following requirements: Password must be at least 6 characters long Password must include at least including 1 upper case letter Password must include at least including 1 lower case letter Password must inclu... 2013-01-29, ∼3879🔥, 0💬

Finding & characters in HTML document
How to find &amp; characters that are not part of HTML entities in HTML code? The the example HTML code is listed below: a & b c &amp; d a &lt; b c &#8364; d c && d The regular expression to find &amp; characters that are not part of HTML entities in an HTML document ... 2013-02-02, ∼3874🔥, 0💬

0 or more times repetition quantifier *
What is the 0 or more times repetition quantifier? How to use it? How to write a regular expression using a repetition quantifier to capture all names and values in a URL query string like this: User=Jack&Age=&City=Pa ris? The "0 or more times" repetition quantifier allows us to repeat a pat... 2013-01-26, ∼3863🔥, 0💬

Validating Brazilian Postcodes
How to write a regular expression to validate Brazilian Postcodes? For example, 23080-060 is a valid Brazilian Postcodes. Here is the regular expression to validate Brazilian Postcodes: \d{5}-\d{3} \d{5} - 2 digits - - A - \d{3} - 3 digits 2013-01-29, ∼3839🔥, 0💬

Parsing header lines of an email message
How write a regular expression to capture all header lines from an email message like this: Return-Path: X-Original-To: test@example.com Delivered-To: test@example.com Message-ID: Date: Thu, 23 Jun 2011 11:26:29 +0200 From: Example Sender To: Example Receiver Subject: Email example Hello Joe, It was... 2013-02-01, ∼3806🔥, 0💬

Parsing the "To:" field from emails
What would be the correct regex pattern to extract email addresses from a string coming from an email form "To" line, that allows the addresses to be delimited by commas ",", semicolons ";", or spaces? For example, the following "To" line contains 4 email addresses: "Joe Smith" , joe@aol.com; someon... 2013-01-30, ∼3798🔥, 0💬

Capturing attributes of XML elements
How to capture attributes of XML elements in XML documents? An example XML document is listed below: The regular expression to capture attributes of XML elements in an XML document can be written as: ([^\s=]+)\s*=\s*"((?:[^"]*\")* [^"]*)"Note that: ([^\s=]+) - Attribute name ((?:[^"]*\")*[^"]*) - At... 2013-02-02, ∼3792🔥, 0💬

Capturing authenticated user name from Apache Web log file
How to capture the authenticated user name 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 "htt... 2013-02-03, ∼3754🔥, 0💬

End of string anchor $
What is the "end of string" anchor in a regular expression? How to use it? How to write a regular expression using "end of string" anchor to validate words ending in 'z': quartz ? The "end of string" anchor is an atomic zero-width assertion specifing that the match must occur at the end of the strin... 2013-01-26, ∼3728🔥, 0💬

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Example General Resource Tools