Example General Resource Tools

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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, ∼3835🔥, 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, ∼3813🔥, 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, ∼3800🔥, 0💬

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, ∼3760🔥, 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, ∼3725🔥, 0💬

Positive look-ahead assertion (?=...)
What is a positive look-ahead assertion? How to use it? How to write a regular expression to find words with 'oo' in text like: how, to, look, google, school ? A positive look-ahead assertion is a zero-width assertion that allows you to match a subpattern beyond the current position (look-ahead) wit... 2013-01-26, ∼3692🔥, 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, ∼3634🔥, 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, ∼3623🔥, 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, ∼3612🔥, 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, ∼3607🔥, 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, ∼3580🔥, 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, ∼3568🔥, 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, ∼3541🔥, 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, ∼3538🔥, 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, ∼3531🔥, 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, ∼3529🔥, 0💬

Capturing cookie string from Apache Web log file
How to capture the cookie string 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=10... 2013-02-04, ∼3483🔥, 0💬

US post code validation
How to perform a validation on US post codes using a regular expression? For example, " 12345-5434 " is an valid US post code. To perform a validation on US post codes, try this regular expression: ^([0-9]{5})(-[0-9]{4})?$ 2013-01-27, ∼3439🔥, 0💬

regex.FYIcenter.com Links
Other Resources: Software QA Resources Developer Resources DBA Resources Windows Tutorials Java JAR Files DLL Files File Extensions Security Certificates Regular Expression Link Directories Interview Q &amp; A Biotech Resources Cell Phone Resources Travel Resources Frequently Asked Questions FYI... 2025-03-17, ∼3435🔥, 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, ∼3410🔥, 0💬

US Social Security Number validation
How to perform a validation on US Social Security Numbers using a regular expression? For example, " 333-23-2329 " is a valid US Social Security Number. To perform a basic validation on US Social Security Numbers, try this regular expression: ^[\d]{3}-[\d]{2}-[\d]{4}$ 2013-01-27, ∼3406🔥, 0💬

Web address URL validation
How to perform a validation on Web address URLs using a regular expression? For example, " http://regex.fyicenter.com/ " is a valid Web address URL. To perform a basic validation on Web address URLs, try this regular expression: ^https?:\/\/([A-Z0-9][-\w]*(\. [A-Z0-9][-\w]*)+):?(\d+)?\/? 2013-01-27, ∼3405🔥, 0💬

Validating United Kingdom postcodes
How to write a regular expression to validate United Kingdom postcodes? For example, EC1A 1BB is a valid UK postcodes. Here is the regular expression to validate United Kingdom postcodes: [A-Z]{1,2}\d[A-Z\d]? \d[ABD-HJLNP-UW-Z]{2} [A-Z]{1,2} - 1 or 2 letters \d - A digit [A-Z\d]? - An optional lette... 2013-01-29, ∼3363🔥, 0💬

Finding blank lines in a text file
How to find blank lines in a text file using regular expression? You can use the following logic to find blank lines in a text file: 1. Read each line from the text file in a loop. 2. Validate each line with this regular expression: ^\s*$ 3. If matched, you know that this line is a blank line. 2013-01-29, ∼3360🔥, 0💬

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Example General Resource Tools