Regular Expressions 101

^start of line

Negative Lookahead(?!www\.|(?:http|ftp)s?://|[A-Za-z]:\\|//)

1st Alternativewww\.

wwwthe literal text www (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

2nd Alternative(?:http|ftp)s?://

Non-Capturing Group(?:http|ftp)

1st Alternativehttp

httpthe literal text http (case sensitive)

2nd Alternativeftp

ftpthe literal text ftp (case sensitive)

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

://the literal text ://

3rd Alternative[A-Za-z]:\\

Character Class[A-Za-z]

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

4th Alternative//

//the literal text //

.*any Unicode character (except for line terminators), repeated any number of times

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^(?!www\.|(?:http|ftp)s?://|[A-Za-z]:\\|//).*

Test String
New

y protocol or double slash //
C:\File
about.html
tutorial1/
tutorial1/2.html
/
/experts/   
../ 
../experts/ 
../../../   
./  
./about.html
http://google.com
www.google.com
//dub-server1/mynode

Regular Expression

Test StringNew

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Test String
New

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