Regular Expressions 101

Explanation
Pro

1st Alternative(Closes #[0-9]{2,6})

Group 1(Closes #[0-9]{2,6})

Closes #the literal text Closes # (case sensitive)

Character Class[0-9]{2,6}

{2,6}matches between 2 and 6 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

2nd Alternative(Fixes keycloak/[\w]{2,50}#[0-9]{2,6})

Group 2(Fixes keycloak/[\w]{2,50}#[0-9]{2,6})

Fixes keycloak/the literal text Fixes keycloak/ (case sensitive)

Character Class[\w]{2,50}

{2,50}matches between 2 and 50 characters from the set below:

\wany word character

#the literal # (35₁₀ / 43₈ / 23₁₆)

Character Class[0-9]{2,6}

{2,6}matches between 2 and 6 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

3rd Alternative(Resolves #[0-9]{2,6}(, resolves #[0-9]{2,6}){1,10})

Group 3(Resolves #[0-9]{2,6}(, resolves #[0-9]{2,6}){1,10})

Resolves #the literal text Resolves # (case sensitive)

Character Class[0-9]{2,6}

{2,6}matches between 2 and 6 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Group 4(, resolves #[0-9]{2,6}){1,10}

{1,10}repeats the group contents below between 1 and 10 times:

, resolves #the literal text , resolves # (case sensitive)

Character Class[0-9]{2,6}

{2,6}matches between 2 and 6 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

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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27 tokens

(Closes #[0-9]{2,6})|(Fixes keycloak/[\w]{2,50}#[0-9]{2,6})|(Resolves #[0-9]{2,6}(, resolves #[0-9]{2,6}){1,10})

There are no unit tests.