Regular Expressions 101

Pro

^start of string

Positive Lookahead(?=.*[a-z])

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

Character Class[a-z]

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

Positive Lookahead(?=.*[A-Z].*[A-Z])

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

Character Class[A-Z]

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

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

Character Class[A-Z]

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

Positive Lookahead(?=.*[^\s])

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

Negated Character Class[^\s]

\sany whitespace character

Positive Lookahead(?=[a-zA-Z!"§$%&\/()=?+])

Character Class[a-zA-Z!"§$%&\/()=?+]

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

!the literal ! (33₁₀ / 41₈ / 21₁₆)

"the literal " (34₁₀ / 42₈ / 22₁₆)

§the literal § (167₁₀ / 247₈ / A7₁₆)

$the literal $ (36₁₀ / 44₈ / 24₁₆)

%the literal % (37₁₀ / 45₈ / 25₁₆)

&the literal & (38₁₀ / 46₈ / 26₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

(the literal ( (40₁₀ / 50₈ / 28₁₆)

)the literal ) (41₁₀ / 51₈ / 29₁₆)

=the literal = (61₁₀ / 75₈ / 3D₁₆)

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

+the literal + (43₁₀ / 53₈ / 2B₁₆)

Negative Lookahead(?!.*\.\w{2,5}$)

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\w{2,5}any word character, repeated between 2 and 5 times

$end of string, or before its final line terminator

.{19,90}any character (except for line terminators), repeated between 19 and 90 times

$end of string, or before its final line terminator

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

Detailed match information will be displayed here automatically.

25 tokens

^(?=.*[a-z])(?=.*[A-Z].*[A-Z])(?=.*[^\s])(?=[a-zA-Z!"§$%&\/()=?+])(?!.*\.\w{2,5}$).{19,90}$

New

aaaaaaaaaaaaaaaAbA$.com

aaaaaaaaaaaaaaaAbA$.com