Regular Expressions 101

^start of line

Positive Lookahead(?=.{6})

.{6}any character (except for line terminators), repeated exactly 6 times

Non-Capturing Group(?:[a-z\d]*[!$#%]){2}

{2}repeats the group contents below exactly 2 times:

Character Class[a-z\d]*

*matches any number of characters from the set below:

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

\da digit

Character Class[!$#%]

!the literal ! (33₁₀ / 41₈ / 21₁₆)

$the literal $ (36₁₀ / 44₈ / 24₁₆)

#the literal # (35₁₀ / 43₈ / 23₁₆)

%the literal % (37₁₀ / 45₈ / 25₁₆)

Character Class[a-z\d!$#%]*

*matches any number of characters from the set below:

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

\da digit

!the literal ! (33₁₀ / 41₈ / 21₁₆)

$the literal $ (36₁₀ / 44₈ / 24₁₆)

#the literal # (35₁₀ / 43₈ / 23₁₆)

%the literal % (37₁₀ / 45₈ / 25₁₆)

$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.

Search reference

Regular Expression

^(?=.{6})(?:[a-z\d]*[!$#%]){2}[a-z\d!$#%]*$

New

abcdef
a##def
a#cdef