Regular Expressions 101

Explanation
Pro

^start of line

Negative Lookahead(?!nightly)

nightlythe literal text nightly (case sensitive)

Group 1((?<compatibility>\w*-?)?)

Group compatibility(?<compatibility>\w*-?)?

?repeats the group contents below at most once:

\w*any word character, repeated any number of times

-?optionally matches the literal - (45₁₀ / 55₈ / 2D₁₆)

Group major(?<major>\d+)

\d+a digit, repeated at least once

Group 4(\.(?<minor>\d+)(\.(?<patch>\d+)([\.-]?(?<build>.*)))?)?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group minor(?<minor>\d+)

\d+a digit, repeated at least once

Group 6(\.(?<patch>\d+)([\.-]?(?<build>.*)))?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group patch(?<patch>\d+)

\d+a digit, repeated at least once

Group 8([\.-]?(?<build>.*))

Character Class[\.-]?

?matches at most one character from the set below:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group build(?<build>.*)

.*any character (except for line terminators), repeated any number of times

Negative Lookahead(?!nightly|developement|develop)

1st Alternativenightly

nightlythe literal text nightly (case sensitive)

2nd Alternativedevelopement

developementthe literal text developement (case sensitive)

3rd Alternativedevelop

developthe literal text develop (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

Ready to run

25 tokens

^(?!nightly)((?<compatibility>\w*-?)?)(?<major>\d+)(\.(?<minor>\d+)(\.(?<patch>\d+)([\.-]?(?<build>.*)))?)?(?!nightly|developement|develop)$