Regular Expressions 101

Pro

1st Alternative^(?:#\s*(?<comment>.*))?$

^start of line

Non-Capturing Group(?:#\s*(?<comment>.*))?

?repeats the group contents below at most once:

#the literal # (35₁₀ / 43₈ / 23₁₆)

\s*any whitespace character, repeated any number of times

Group comment(?<comment>.*)

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

$end of line

2nd Alternative^(?<command>\w+)(?:\.(?<type>\w+))?(?:[ \t]+(?<value>\w+))?$

^start of line

Group command(?<command>\w+)

\w+any word character, repeated at least once

Non-Capturing Group(?:\.(?<type>\w+))?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group type(?<type>\w+)

\w+any word character, repeated at least once

Non-Capturing Group(?:[ \t]+(?<value>\w+))?

?repeats the group contents below at most once:

Character Class[ \t]+

+matches at least one character from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

\ta tab character (ASCII 9)

Group value(?<value>\w+)

\w+any word character, repeated at least once

$end of line

Global pattern flags

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

g modifier: global. Finds all matches instead of stopping after the first

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25 tokens

^(?:#\s*(?<comment>.*))?$|^(?<command>\w+)(?:\.(?<type>\w+))?(?:[ \t]+(?<value>\w+))?$

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