Regular Expressions 101

Pro

^start of line

s?optionally matches the literal s (115₁₀ / 163₈ / 73₁₆) (case sensitive)

Group 1([/|@#])

Character Class[/|@#]

/the literal / (47₁₀ / 57₈ / 2F₁₆)

|the literal | (124₁₀ / 174₈ / 7C₁₆)

@the literal @ (64₁₀ / 100₈ / 40₁₆)

#the literal # (35₁₀ / 43₈ / 23₁₆)

Group 2((?!\1).)+

+repeats the group contents below at least once:

Negative Lookahead(?!\1)

\1the text saved by group 1

.any character (except for line terminators)

\1the text saved by group 1

Group 3((?!\1).)*

*repeats the group contents below any number of times:

Negative Lookahead(?!\1)

\1the text saved by group 1

.any character (except for line terminators)

\1the text saved by group 1

Group 4((gi?|ig)(\1\d\d?)?|i)?

?repeats the group contents below at most once:

1st Alternative(gi?|ig)(\1\d\d?)?

Group 5(gi?|ig)

1st Alternativegi?

gthe literal g (103₁₀ / 147₈ / 67₁₆) (case sensitive)

i?optionally matches the literal i (105₁₀ / 151₈ / 69₁₆) (case sensitive)

2nd Alternativeig

igthe literal text ig (case sensitive)

Group 6(\1\d\d?)?

?repeats the group contents below at most once:

\1the text saved by group 1

\da digit

\d?optionally matches a digit

2nd Alternativei

ithe literal i (105₁₀ / 151₈ / 69₁₆) (case sensitive)

$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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26 tokens

^s?([/|@#])((?!\1).)+\1((?!\1).)*\1((gi?|ig)(\1\d\d?)?|i)?$

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