Regular Expressions 101

(?x)applies the following effective flags to the remainder of the pattern: gmix

x modifier: extended. Ignores unescaped whitespace and comments outside character classes

Comment: ignora isso é para aceitar multi linha e comentario

^start of line

Comment: inicio

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)

Comment: procura por caracteres `a` atá `z` pelo menos 1

Positive Lookahead(?=(?:.*?\d){9})

Non-Capturing Group(?:.*?\d){9}

{9}repeats the group contents below exactly 9 times:

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

\da digit

Comment: procura por 9 digitos

Character Class[a-z\d ]{12,}

{12,}matches at least 12 characters from the set below:

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

\da digit

the literal (32₁₀ / 40₈ / 20₁₆)

Comment: tem que ter 12 digitos ou mais entre `a` e `z` numeros e espaços

$end of line

Comment: fim

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

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

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Regular Expression

(?x) #ignora isso é para aceitar multi linha e comentario

^ # inicio
(?=.*?[a-z]) # procura por caracteres `a` atá `z` pelo menos 1
(?=(?:.*?\d){9}) # procura por 9 digitos 
[a-z\d ]{12,} # tem que ter 12 digitos ou mais entre `a` e `z`  numeros e espaços

$ # fim

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