Regular Expressions 101

Explanation

Pro

\ban ASCII word boundary

Non-Capturing Group(?:(?:https?|ftp):\/\/)

Non-Capturing Group(?:https?|ftp)

1st Alternativehttps?

httpthe literal text http (case insensitive)

s?optionally matches the literal s (115₁₀ / 163₈ / 73₁₆) (case insensitive)

2nd Alternativeftp

ftpthe literal text ftp (case insensitive)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Non-Capturing Group(?:\S+(?::\S*)?@)?

?repeats the group contents below at most once:

\S+any non-whitespace character, repeated at least once

Non-Capturing Group(?::\S*)?

?repeats the group contents below at most once:

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\S*any non-whitespace character, repeated any number of times

@the literal @ (64₁₀ / 100₈ / 40₁₆)

Non-Capturing Group(?:(?!10(?:\.\d{1,3}){3})(?!127(?:\.\d{1,3}){3})(?!169\.254(?:\.\d{1,3}){2})(?!192\.168(?:\.\d{1,3}){2})(?!172\.(?:1[6-9]|2\d|3[0-1])(?:\.\d{1,3}){2})(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(?:(?:[a-z\x{00a1}-\x{ffff}0-9]+-?)*[a-z\x{00a1}-\x{ffff}0-9]+)(?:\.(?:[a-z\x{00a1}-\x{ffff}0-9]+-?)*[a-z\x{00a1}-\x{ffff}0-9]+)*(?:\.(?:[a-z\x{00a1}-\x{ffff}]{2,})))

1st Alternative(?!10(?:\.\d{1,3}){3})(?!127(?:\.\d{1,3}){3})(?!169\.254(?:\.\d{1,3}){2})(?!192\.168(?:\.\d{1,3}){2})(?!172\.(?:1[6-9]|2\d|3[0-1])(?:\.\d{1,3}){2})(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))

Negative Lookahead(?!10(?:\.\d{1,3}){3})

10the literal text 10

Non-Capturing Group(?:\.\d{1,3}){3}

{3}repeats the group contents below exactly 3 times:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{1,3}a digit, repeated between 1 and 3 times

Negative Lookahead(?!127(?:\.\d{1,3}){3})

127the literal text 127

Non-Capturing Group(?:\.\d{1,3}){3}

{3}repeats the group contents below exactly 3 times:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{1,3}a digit, repeated between 1 and 3 times

Negative Lookahead(?!169\.254(?:\.\d{1,3}){2})

169the literal text 169

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

254the literal text 254

Non-Capturing Group(?:\.\d{1,3}){2}

{2}repeats the group contents below exactly 2 times:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{1,3}a digit, repeated between 1 and 3 times

Negative Lookahead(?!192\.168(?:\.\d{1,3}){2})

192the literal text 192

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

168the literal text 168

Non-Capturing Group(?:\.\d{1,3}){2}

{2}repeats the group contents below exactly 2 times:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{1,3}a digit, repeated between 1 and 3 times

Negative Lookahead(?!172\.(?:1[6-9]|2\d|3[0-1])(?:\.\d{1,3}){2})

172the literal text 172

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:1[6-9]|2\d|3[0-1])

1st Alternative1[6-9]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[6-9]

6-9one character from 6 (54₁₀) to 9 (57₁₀)

2nd Alternative2\d

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

\da digit

3rd Alternative3[0-1]

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

Character Class[0-1]

0-1one character from 0 (48₁₀) to 1 (49₁₀)

Non-Capturing Group(?:\.\d{1,3}){2}

{2}repeats the group contents below exactly 2 times:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{1,3}a digit, repeated between 1 and 3 times

Non-Capturing Group(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])

1st Alternative[1-9]\d?

2nd Alternative1\d\d

3rd Alternative2[01]\d

4th Alternative22[0-3]

Non-Capturing Group(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}

Non-Capturing Group(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))

2nd Alternative(?:(?:[a-z\x{00a1}-\x{ffff}0-9]+-?)*[a-z\x{00a1}-\x{ffff}0-9]+)(?:\.(?:[a-z\x{00a1}-\x{ffff}0-9]+-?)*[a-z\x{00a1}-\x{ffff}0-9]+)*(?:\.(?:[a-z\x{00a1}-\x{ffff}]{2,}))

Non-Capturing Group(?::\d{2,5})?

Non-Capturing Group(?:\/[^\s]*)?

\ban ASCII word boundary

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

\b(?:(?:https?|ftp):\/\/)(?:\S+(?::\S*)?@)?(?:(?!10(?:\.\d{1,3}){3})(?!127(?:\.\d{1,3}){3})(?!169\.254(?:\.\d{1,3}){2})(?!192\.168(?:\.\d{1,3}){2})(?!172\.(?:1[6-9]|2\d|3[0-1])(?:\.\d{1,3}){2})(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(?:(?:[a-z\x{00a1}-\x{ffff}0-9]+-?)*[a-z\x{00a1}-\x{ffff}0-9]+)(?:\.(?:[a-z\x{00a1}-\x{ffff}0-9]+-?)*[a-z\x{00a1}-\x{ffff}0-9]+)*(?:\.(?:[a-z\x{00a1}-\x{ffff}]{2,})))(?::\d{2,5})?(?:\/[^\s]*)?\b

http://balancing-blessings.com/BookLinks.php
http://cvm.org.uk/links
http://deeptruths.com/links.html
http://evangelicalarminians.org/links-and-books/
http://gracebibleny.org/bible_study_resources
http://greybullcma.org/Links.html
http://howardmiami.org/links.htm
http://imofinc.org/internet-links/
http://jesus.scilla.org.uk/p/links.html
http://lifebridge.ca/resources/links/
http://marttimuukkonen.pp.fi/Christianlinks.htm
http://padstowcong.com/contact-links/
http://pottershouseseminarybiblecollege.com/student-resources
http://sacred-assembly.org/links1.html
http://sage.nowsprouting.com/waxahachiebiblechurch/resources/bible-reading/
http://sandramiller.org/BookLinks.php
http://tarotcanada.org/index-MoreLinks.html
http://theeffect.org/resources/links.html
http://tylandbaptist.com/resources.htm
http://untbsm.com/resources/discipleship/
http://valrosa.com/Links/links.htm
http://www.adlibchristianarts.org/links.shtml
http://www.balancingblessings.com/BookLinks.php
http://www.bcbsr.com/clink