regex101: PCRE (Legacy) Match Workspace

(?J)applies the following effective flags to the remainder of the pattern: gxJ

J modifier: Allow duplicate subpattern names

httpthe literal text http (case sensitive)

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

://the literal text ://

Non-Capturing Group(?:[a-z0-9]+\.)?

?repeats the group contents below at most once:

Character Class[a-z0-9]+

+matches at least one character from the set below:

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

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

livestreamthe literal text livestream (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

com/ the literal text com/ (case sensitive)

Non-Capturing Group(?: (?<id>accounts/[0-9]+/events/[0-9]+(?:/videos/[0-9]+)?) | [^\s/]+/video\?clipId=(?<id>[^\s&]+) | (?<id>[^\s/]+) )

1st Alternative (?<id>accounts/[0-9]+/events/[0-9]+(?:/videos/[0-9]+)?)

Group id(?<id>accounts/[0-9]+/events/[0-9]+(?:/videos/[0-9]+)?)

accounts/the literal text accounts/ (case sensitive)

Character Class[0-9]+

+matches at least one character from the set below:

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

/events/the literal text /events/ (case sensitive)

Character Class[0-9]+

+matches at least one character from the set below:

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

Non-Capturing Group(?:/videos/[0-9]+)?

?repeats the group contents below at most once:

/videos/the literal text /videos/ (case sensitive)

Character Class[0-9]+

+matches at least one character from the set below:

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

2nd Alternative [^\s/]+/video\?clipId=(?<id>[^\s&]+)

Negated Character Class[^\s/]+

+matches at least one character outside the set below:

\sany whitespace character

/the literal / (47₁₀ / 57₈ / 2F₁₆)

/videothe literal text /video (case sensitive)

\?the literal ? (63₁₀ / 77₈ / 3F₁₆)

clipId=the literal text clipId= (case sensitive)

Group id(?<id>[^\s&]+)

Negated Character Class[^\s&]+

+matches at least one character outside the set below:

\sany whitespace character

&the literal & (38₁₀ / 46₈ / 26₁₆)

3rd Alternative (?<id>[^\s/]+)

Group id(?<id>[^\s/]+)

Negated Character Class[^\s/]+

+matches at least one character outside the set below:

\sany whitespace character

/the literal / (47₁₀ / 57₈ / 2F₁₆)

Global pattern flags

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

x modifier: extended. Ignores unescaped whitespace and comments outside character classes

Search reference

Regular Expression

(?J)https?://(?:[a-z0-9]+\.)?livestream\.com/
(?:
    (?<id>accounts/[0-9]+/events/[0-9]+(?:/videos/[0-9]+)?)
  |
    [^\s/]+/video\?clipId=(?<id>[^\s&]+)
  |
    (?<id>[^\s/]+)
)

Unit Tests

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