Regular Expressions 101

Pro

^start of line

(?i)applies the following effective flags to the remainder of the pattern: gmi

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

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

Group 1([mutex])

Character Class[mutex]

mthe literal m (109₁₀ / 155₈ / 6D₁₆) (case insensitive)

uthe literal u (117₁₀ / 165₈ / 75₁₆) (case insensitive)

tthe literal t (116₁₀ / 164₈ / 74₁₆) (case insensitive)

ethe literal e (101₁₀ / 145₈ / 65₁₆) (case insensitive)

xthe literal x (120₁₀ / 170₈ / 78₁₆) (case insensitive)

\1{2}the text saved by group 1, repeated exactly 2 times

Character Class[mutex]*

*matches any number of characters from the set below:

mthe literal m (109₁₀ / 155₈ / 6D₁₆) (case insensitive)

uthe literal u (117₁₀ / 165₈ / 75₁₆) (case insensitive)

tthe literal t (116₁₀ / 164₈ / 74₁₆) (case insensitive)

ethe literal e (101₁₀ / 145₈ / 65₁₆) (case insensitive)

xthe literal x (120₁₀ / 170₈ / 78₁₆) (case insensitive)

$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

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25 tokens

^(?i).*([mutex])\1{2}[mutex]*$

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