Regular Expressions 101

^start of line

Group 1((?:microsoft )?(?:win|windows)(?:[ ]| server )?(?:2003|2008|2012|2019|2016)(?: r2)?(?: std)?)

Non-Capturing Group(?:microsoft )?

?repeats the group contents below at most once:

microsoft the literal text microsoft (case sensitive)

Non-Capturing Group(?:win|windows)

1st Alternativewin

winthe literal text win (case sensitive)

2nd Alternativewindows

windowsthe literal text windows (case sensitive)

Non-Capturing Group(?:[ ]| server )?

?repeats the group contents below at most once:

1st Alternative[ ]

Character Class[ ]

the literal (32₁₀ / 40₈ / 20₁₆)

2nd Alternative server

server the literal text server (case sensitive)

Non-Capturing Group(?:2003|2008|2012|2019|2016)

1st Alternative2003

2003the literal text 2003

2nd Alternative2008

2008the literal text 2008

3rd Alternative2012

2012the literal text 2012

4th Alternative2019

2019the literal text 2019

5th Alternative2016

2016the literal text 2016

Non-Capturing Group(?: r2)?

?repeats the group contents below at most once:

r2the literal text r2 (case sensitive)

Non-Capturing Group(?: std)?

?repeats the group contents below at most once:

stdthe literal text std (case sensitive)

$end of line

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

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25 tokens

Regular Expression

^((?:microsoft )?(?:win|windows)(?:[ ]| server )?(?:2003|2008|2012|2019|2016)(?: r2)?(?: std)?)$

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