Regular Expressions 101

Group 1(https?:\/\/)

httpthe literal text http (case sensitive)

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

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 2(\s)?

?repeats the group contents below at most once:

\sa Unicode whitespace character

Group 3(www\.)?

?repeats the group contents below at most once:

wwwthe literal text www (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 4(\s?)

\s?optionally matches a Unicode whitespace character

Group 5(\w+\.)*

*repeats the group contents below any number of times:

\w+a Unicode word character, repeated at least once

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 6([\w\-\s]+\/)*

*repeats the group contents below any number of times:

Character Class[\w\-\s]+

+matches at least one character from the set below:

\wa Unicode word character

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

\sa Unicode whitespace character

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 7([\w-]+)

Character Class[\w-]+

+matches at least one character from the set below:

\wa Unicode word character

-the literal - (45₁₀ / 55₈ / 2D₁₆)

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

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

(https?:\/\/)(\s)?(www\.)?(\s?)(\w+\.)*([\w\-\s]+\/)*([\w-]+)\/?

New

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I liked a @YouTube video http:// youtu.be/7PS9

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https://www. usatoday.com/story/news/wor ld/2018/01/02/mountains-u-s-recycling-pile-up-china-restricts-imports/995134001/
https://regex101.com/r/NmVGOo/1

Regular Expression

Extraction