Regular Expressions 101

Positive Lookahead(?=\w)

\wa Unicode word character

Positive Lookahead(?=.*[@#a])

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

Character Class[@#a]

@the literal @ (64₁₀ / 100₈ / 40₁₆)

#the literal # (35₁₀ / 43₈ / 23₁₆)

athe literal a (97₁₀ / 141₈ / 61₁₆) (case sensitive)

Character Class[\w]+

+matches at least one character from the set below:

\wa Unicode word character

Positive Lookahead(?=\w)

\wa Unicode word character

Positive Lookahead(?=.*[@#b])

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

Character Class[@#b]

@the literal @ (64₁₀ / 100₈ / 40₁₆)

#the literal # (35₁₀ / 43₈ / 23₁₆)

bthe literal b (98₁₀ / 142₈ / 62₁₆) (case sensitive)

Character Class[\w]+

+matches at least one character from the set below:

\wa Unicode word character

Positive Lookahead(?=\w)

\wa Unicode word character

Positive Lookahead(?=.*[@#c])

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

Character Class[@#c]

@the literal @ (64₁₀ / 100₈ / 40₁₆)

#the literal # (35₁₀ / 43₈ / 23₁₆)

cthe literal c (99₁₀ / 143₈ / 63₁₆) (case sensitive)

Character Class[\w]+

+matches at least one character from the set below:

\wa Unicode word character

the literal ↵ (10₁₀ / 12₈ / A₁₆)

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Search reference

Regular Expression

(?=\w)(?=.*[@#a])[\w]+(?=\w)(?=.*[@#b])[\w]+(?=\w)(?=.*[@#c])[\w]+

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