regex101: PCRE (Legacy) Match Workspace

^start of string

Group 1( ( # a dummy option, defines some frequently used capture groups (?!x)x # always false, so nothing matches this and the following groups ever (?'name'[^_]+) # group "name" (?'os'windows|linux|osx) # group "os" ) | ( # pattern foo foo_\g'name'_\g'os' ) | ( # pattern bar \g'name'_bar_\g'os'_foo_\g'os' ) )

1st Alternative ( # a dummy option, defines some frequently used capture groups (?!x)x # always false, so nothing matches this and the following groups ever (?'name'[^_]+) # group "name" (?'os'windows|linux|osx) # group "os" )

Group 2( # a dummy option, defines some frequently used capture groups (?!x)x # always false, so nothing matches this and the following groups ever (?'name'[^_]+) # group "name" (?'os'windows|linux|osx) # group "os" )

Comment: a dummy option, defines some frequently used capture groups

Negative Lookahead(?!x)

xthe literal x (120₁₀ / 170₈ / 78₁₆) (case sensitive)

x the literal text x (case sensitive)

Comment: always false, so nothing matches this and the following groups ever

Group name(?'name'[^_]+)

Negated Character Class[^_]+

+matches at least one character outside the set below:

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Comment: group "name"

Group os(?'os'windows|linux|osx)

1st Alternativewindows

windowsthe literal text windows (case sensitive)

2nd Alternativelinux

linuxthe literal text linux (case sensitive)

3rd Alternativeosx

osxthe literal text osx (case sensitive)

Comment: group "os"

2nd Alternative ( # pattern foo foo_\g'name'_\g'os' )

Group 5( # pattern foo foo_\g'name'_\g'os' )

Comment: pattern foo

foo_the literal text foo_ (case sensitive)

\g'name'calls group name as a subroutine

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

\g'os'calls group os as a subroutine

3rd Alternative ( # pattern bar \g'name'_bar_\g'os'_foo_\g'os' )

Group 6( # pattern bar \g'name'_bar_\g'os'_foo_\g'os' )

Comment: pattern bar

\g'name'calls group name as a subroutine

_bar_the literal text _bar_ (case sensitive)

\g'os'calls group os as a subroutine

_foo_the literal text _foo_ (case sensitive)

\g'os'calls group os as a subroutine

$end of string, or before its final line terminator

Global pattern flags

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

25 tokens

Regular Expression

^(
    ( # a dummy option, defines some frequently used capture groups
        (?!x)x # always false, so nothing matches this and the following groups ever
        (?'name'[^_]+) # group "name"
        (?'os'windows|linux|osx) # group "os"
    )
    |
    ( # pattern foo
        foo_\g'name'_\g'os'
    )
    |
    ( # pattern bar
        \g'name'_bar_\g'os'_foo_\g'os'
    )
)$

Unit Tests

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