Regular Expressions 101

^start of string

Group 1(([а-яa-zё0-9]){2})

Group 2([а-яa-zё0-9]){2}

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

Character Class[а-яa-zё0-9]

а-яone character from а (1072₁₀) to я (1103₁₀) (case insensitive)

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

ёthe literal ё (1105₁₀ / 2121₈ / 451₁₆) (case insensitive)

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 3((?2){2})

(?2){2}calls group 2 as a subroutine, repeated exactly 2 times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 4((?2){3})

(?2){3}calls group 2 as a subroutine, repeated exactly 3 times

$end of string, or before its final line terminator

Global pattern flags

u modifier: unicode. Treats the pattern and subject as UTF-16

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^(([а-яa-zё0-9]){2})\.((?2){2})\.((?2){3})$

New

d1.df.dfd