Regular Expressions 101

Explanation

Pro

Positive Lookbehind(?<=(?!(https*://)*((127)|(192\.168)|(0\.0\.0\.0)))(?:(?:https*://)|^))

Negative Lookahead(?!(https*://)*((127)|(192\.168)|(0\.0\.0\.0)))

Group 1(https*://)*

*repeats the group contents below any number of times:

httpthe literal text http (case sensitive)

s*the literal s (115₁₀ / 163₈ / 73₁₆) (case sensitive), repeated any number of times

://the literal text ://

Group 2((127)|(192\.168)|(0\.0\.0\.0))

1st Alternative(127)

Group 3(127)

127the literal text 127

2nd Alternative(192\.168)

Group 4(192\.168)

192the literal text 192

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

168the literal text 168

3rd Alternative(0\.0\.0\.0)

Group 5(0\.0\.0\.0)

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Non-Capturing Group(?:(?:https*://)|^)

1st Alternative(?:https*://)

Non-Capturing Group(?:https*://)

httpthe literal text http (case sensitive)

s*the literal s (115₁₀ / 163₈ / 73₁₆) (case sensitive), repeated any number of times

://the literal text ://

2nd Alternative^

^start of line

Non-Capturing Group(?:(?:2[0-5][0-5]|1[0-9]{2}|[0-9]{1,2})\.(?:2[0-5][0-5]|1[0-9]{2}|[0-9]{1,2})\.(?:2[0-5][0-5]|1[0-9]{2}|[0-9]{1,2})\.(?:2[0-5][0-5]|1[0-9]{2}|[0-9]{1,2}))

Non-Capturing Group(?:2[0-5][0-5]|1[0-9]{2}|[0-9]{1,2})

1st Alternative2[0-5][0-5]

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[0-5]

0-5one character from 0 (48₁₀) to 5 (53₁₀)

Character Class[0-5]

0-5one character from 0 (48₁₀) to 5 (53₁₀)

2nd Alternative1[0-9]{2}

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-9]{2}

{2}matches exactly 2 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

3rd Alternative[0-9]{1,2}

Character Class[0-9]{1,2}

{1,2}matches between 1 and 2 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:2[0-5][0-5]|1[0-9]{2}|[0-9]{1,2})

1st Alternative2[0-5][0-5]

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[0-5]

Character Class[0-5]

2nd Alternative1[0-9]{2}

3rd Alternative[0-9]{1,2}

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:2[0-5][0-5]|1[0-9]{2}|[0-9]{1,2})

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:2[0-5][0-5]|1[0-9]{2}|[0-9]{1,2})

Positive Lookahead(?=[^\d\s]|$)

Global pattern flags

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

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Unit Test Summary

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Quick Reference

25 tokens

Regular Expression

(?<=(?!(https*://)*((127)|(192\.168)|(0\.0\.0\.0)))(?:(?:https*://)|^))(?:(?:2[0-5][0-5]|1[0-9]{2}|[0-9]{1,2})\.(?:2[0-5][0-5]|1[0-9]{2}|[0-9]{1,2})\.(?:2[0-5][0-5]|1[0-9]{2}|[0-9]{1,2})\.(?:2[0-5][0-5]|1[0-9]{2}|[0-9]{1,2}))(?=[^\d\s]|$)

Unit Tests

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