regex101: PCRE (Legacy) Substitution Workspace

^start of string

Group 1(https?[^\s?]+\?)

httpthe literal text http (case sensitive)

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

Negated Character Class[^\s?]+

+matches at least one character outside the set below:

\sany whitespace character

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

\?the literal ? (63₁₀ / 77₈ / 3F₁₆)

Group 2([^\s=]+=[^\s&]+)

Negated Character Class[^\s=]+

+matches at least one character outside the set below:

\sany whitespace character

=the literal = (61₁₀ / 75₈ / 3D₁₆)

Negated Character Class[^\s&]+

+matches at least one character outside the set below:

\sany whitespace character

&the literal & (38₁₀ / 46₈ / 26₁₆)

Non-Capturing Group(?:\&([^\s=]+=[^\s&]+))?

?repeats the group contents below at most once:

\&the literal & (38₁₀ / 46₈ / 26₁₆)

Group 3([^\s=]+=[^\s&]+)

Negated Character Class[^\s=]+

+matches at least one character outside the set below:

\sany whitespace character

=the literal = (61₁₀ / 75₈ / 3D₁₆)

Negated Character Class[^\s&]+

+matches at least one character outside the set below:

\sany whitespace character

&the literal & (38₁₀ / 46₈ / 26₁₆)

Non-Capturing Group(?:\&([^\s=]+=[^\s&]+))?

?repeats the group contents below at most once:

\&the literal & (38₁₀ / 46₈ / 26₁₆)

Group 4([^\s=]+=[^\s&]+)

Negated Character Class[^\s=]+

+matches at least one character outside the set below:

\sany whitespace character

=the literal = (61₁₀ / 75₈ / 3D₁₆)

Negated Character Class[^\s&]+

+matches at least one character outside the set below:

\sany whitespace character

&the literal & (38₁₀ / 46₈ / 26₁₆)

Non-Capturing Group(?:\&([^\s=]+=[^\s&]+))?

?repeats the group contents below at most once:

\&the literal & (38₁₀ / 46₈ / 26₁₆)

Group 5([^\s=]+=[^\s&]+)

Negated Character Class[^\s=]+

+matches at least one character outside the set below:

\sany whitespace character

=the literal = (61₁₀ / 75₈ / 3D₁₆)

Negated Character Class[^\s&]+

+matches at least one character outside the set below:

\sany whitespace character

&the literal & (38₁₀ / 46₈ / 26₁₆)

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

^(https?[^\s?]+\?)
([^\s=]+=[^\s&]+)
(?:\&([^\s=]+=[^\s&]+))?
(?:\&([^\s=]+=[^\s&]+))?
(?:\&([^\s=]+=[^\s&]+))?

New

https://github.com/search?utf8=%E2%9C%93&q=regex%20play&type=Repositories&ref=searchresults
 https://github.com/search?utf8=%E2%9C%93&q=regex+play&type=Repositories&ref=searchresults&o=desc&s=updated

Substitution

 \1\2&\3&\4&\5&o=desc&s=updated