Regular Expressions 101

^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

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 insensitive)

Positive Lookahead(?=.*[0-9])

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

Character Class[0-9]

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Character Class[a-z0-9#.!@$*&_]{5,12}

{5,12}matches between 5 and 12 characters from the set below:

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

0-9one character from 0 (48₁₀) to 9 (57₁₀)

#the literal # (35₁₀ / 43₈ / 23₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

!the literal ! (33₁₀ / 41₈ / 21₁₆)

@the literal @ (64₁₀ / 100₈ / 40₁₆)

$the literal $ (36₁₀ / 44₈ / 24₁₆)

*the literal * (42₁₀ / 52₈ / 2A₁₆)

&the literal & (38₁₀ / 46₈ / 26₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

$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

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

^(?i)(?=.*[a-z])(?=.*[0-9])[a-z0-9#.!@$*&_]{5,12}$

New

gjsajhgjagf
2983784686

gjsajhAjhfj2

gjsajhgjagf
2983784686

gjsajhAjhfj2