Regular Expressions 101

^start of line

Positive Lookahead(?=.*?[a-zA-Z\d])

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

Character Class[a-zA-Z\d]

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

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

\da digit

Character Class[\w@#&*+=-]+

+matches at least one character from the set below:

\wany word character

@the literal @ (64₁₀ / 100₈ / 40₁₆)

#the literal # (35₁₀ / 43₈ / 23₁₆)

&the literal & (38₁₀ / 46₈ / 26₁₆)

*the literal * (42₁₀ / 52₈ / 2A₁₆)

+the literal + (43₁₀ / 53₈ / 2B₁₆)

=the literal = (61₁₀ / 75₈ / 3D₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

$end of line

Global pattern flags

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

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

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^(?=.*?[a-zA-Z\d])[\w@#&*+=-]+$

New

Allowed:
Abc*+=-_
Abc
*hg8
*+dfg

Not allowed:
*+