regex101: JavaScript Match Workspace

Group 1([a-z][a-z0-9.]+:\/\/\/?)?

?repeats the group contents below at most once:

Character Class[a-z]

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

Character Class[a-z0-9.]+

+matches at least one character from the set below:

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

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

.the literal . (46₁₀ / 56₈ / 2E₁₆)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\/?optionally matches the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 2(localhost|[\d\w.:]+)

1st Alternativelocalhost

localhostthe literal text localhost (case insensitive)

2nd Alternative[\d\w.:]+

Character Class[\d\w.:]+

+matches at least one character from the set below:

\da digit

\wany word character

.the literal . (46₁₀ / 56₈ / 2E₁₆)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Group 3(:\d+)?

?repeats the group contents below at most once:

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\d+a digit, repeated at least once

Group 4(\/\S+)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

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

Global pattern flags

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

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

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

Search reference

Regular Expression

([a-z][a-z0-9.]+:\/\/\/?)?(localhost|[\d\w.:]+)(:\d+)?(\/\S+)

New

any non-whitespace
([a-z][a-z0-9-+.]+:\/\/|www\.).+?(?=\s|$)
original: http://example.com/my file.txt
encoded: http://example.com/my%20file.txt

www.hello.there/fdfsdf fdf.txt
localhost:6000/

let linkEreg =      /(?:[a-z][a-z0-9-+.]+:\/\/|www\.).+?(?=\s|$)/gi;
let linkEregLocal = /(?:[a-z][a-z0-9-+.]+:\/\/|www\.).+?(?=\s|$)/i;
ad111://hello/d
www.hello
blob:https://mozilla.org:443/
blob:https://mozilla.org:443/1
(localhost(:\d+)?|[\w:\d]+)\/
file:///C:/Users/Example%20User/Documents/file%20name.txt
file:///C:/Users/Example User/Documents/file name.txt

!!! really good ereg ([a-z][a-z0-9-+.]+:\/\/)*(localhost|[\d\w.]+)(:\d+)?\/ !!!
([a-z][a-z0-9-+.]+:\/\/)*(localhost|[\d\w.]+)(:\d+)?(\/[\S%]+)
(?:[a-z][a-z0-9-+.]+:\/\/)*(?:localhost|[\d\w.]+)(?::\d+)?(\/\S+)
(?:[a-z][a-z0-9.]+:\/\/)*(?:localhost|[\d\w.:]+)(?::\d+)?(\/\S+)

hello world/ hello\ =\= =/= a/a

www.example.com/%E0%A4%A