Regular Expressions 101

^start of line

Group 1((\[\$[^\]]+\])?([^\^$\\{\@\"\!]*?|~?\/.+\/))

Group 2(\[\$[^\]]+\])?

?repeats the group contents below at most once:

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

\$the literal $ (36₁₀ / 44₈ / 24₁₆)

Negated Character Class[^\]]+

+matches at least one character outside the set below:

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

Group 3([^\^$\\{\@\"\!]*?|~?\/.+\/)

1st Alternative[^\^$\\{\@\"\!]*?

Negated Character Class[^\^$\\{\@\"\!]*?

*?matches any number of characters outside the set below:

\^the literal ^ (94₁₀ / 136₈ / 5E₁₆)

$the literal $ (36₁₀ / 44₈ / 24₁₆)

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

{the literal { (123₁₀ / 173₈ / 7B₁₆)

\@the literal @ (64₁₀ / 100₈ / 40₁₆)

\"the literal " (34₁₀ / 42₈ / 22₁₆)

\!the literal ! (33₁₀ / 41₈ / 21₁₆)

2nd Alternative~?\/.+\/

~?optionally matches the literal ~ (126₁₀ / 176₈ / 7E₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

.+any character (except for line terminators), repeated at least once

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 4(#@?[$?]{1,2}#|#@?%#(?=\/\/)|#@?#[\^\+]?|\$\@?\$)

1st Alternative#@?[$?]{1,2}#

#the literal # (35₁₀ / 43₈ / 23₁₆)

@?optionally matches the literal @ (64₁₀ / 100₈ / 40₁₆)

Character Class[$?]{1,2}

{1,2}matches between 1 and 2 characters from the set below:

$the literal $ (36₁₀ / 44₈ / 24₁₆)

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

#the literal # (35₁₀ / 43₈ / 23₁₆)

2nd Alternative#@?%#(?=\/\/)

#the literal # (35₁₀ / 43₈ / 23₁₆)

@?optionally matches the literal @ (64₁₀ / 100₈ / 40₁₆)

%#the literal text %#

Positive Lookahead(?=\/\/)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

3rd Alternative#@?#[\^\+]?

#the literal # (35₁₀ / 43₈ / 23₁₆)

@?optionally matches the literal @ (64₁₀ / 100₈ / 40₁₆)

#the literal # (35₁₀ / 43₈ / 23₁₆)

Character Class[\^\+]?

?matches at most one character from the set below:

\^the literal ^ (94₁₀ / 136₈ / 5E₁₆)

\+the literal + (43₁₀ / 53₈ / 2B₁₆)

4th Alternative\$\@?\$

\$the literal $ (36₁₀ / 44₈ / 24₁₆)

\@?optionally matches the literal @ (64₁₀ / 100₈ / 40₁₆)

\$the literal $ (36₁₀ / 44₈ / 24₁₆)

Group 5(.*)

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

$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

x

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25 tokens

Regular Expression

^((\[\$[^\]]+\])?([^\^$\\{\@\"\!]*?|~?\/.+\/))(#@?[$?]{1,2}#|#@?%#(?=\/\/)|#@?#[\^\+]?|\$\@?\$)(.*)$

Unit Tests

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