regex101: .NET 10.0 (C#) Substitution Workspace

\ba Unicode word boundary

Group 1(https?://\S+/)

httpthe literal text http (case sensitive)

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

://the literal text ://

\S+any character that is not Unicode whitespace, repeated at least once

/the literal / (47₁₀ / 57₈ / 2F₁₆)

Negated Character Class[^\s?#/]+

+matches at least one character outside the set below:

\sa Unicode whitespace character

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

#the literal # (35₁₀ / 43₈ / 23₁₆)

/the literal / (47₁₀ / 57₈ / 2F₁₆)

Negative Lookahead(?![^\s?#])

Negated Character Class[^\s?#]

\sa Unicode whitespace character

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

#the literal # (35₁₀ / 43₈ / 23₁₆)

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

Search reference

Regular Expression

\b(https?://\S+/)[^\s?#/]+(?![^\s?#])

New

For any of the following URLs, I'm looking for a match for segment as follows:

    https://example.com/what-not/segment matches segment
    https://example.com/what-not/segment?a=b matches segment
    https://example.com/what-not/segment#a matches segment

In case there is a match for segment, I'm going to replace it with segment/.

For any of the following URLs, there should be no match:

    https://example.com/what-not/segment/ no match
    https://example.com/what-not/segment/?a=b no match
    https://example.com/what-not/segment/#a no match

Substitution

$1segment/