question `@Matches` decorator with my regex shows true sometimes while false sometimes

I am using class-validator with nestjs. I have a password field like this:

  @Matches(/^(?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[@#$%^&+=]).{6,64}$/gm, {
    message:
      'Password must be between 6 and 64 characters long with 1 special character and capital character each',
  })

but sometimes the password passes this while sometimes it doesnt

[aozisik]

@windok , @rubiin Please read the following thread on the use of g flag. It makes the regex object stateful, which explains this bug.

I guess you’ll have to avoid that flag to fix the issue.

https://stackoverflow.com/questions/6739136/consecutive-calls-to-regexp-test-fail-for-pattern-with-global-option

[kazemimorteza68]

I have the same problem

@IsString()
 @MinLength(8)
 @MaxLength(20)
 @Matches(/((?=.*[a-z])(?=.*[A-Z])(?=.*[0-9])(?=.*[@$!%*?&])[A-Za-z0-9@$!%*?&]+)+/g)
 password: string;

@Matches(‘^09[0-9]{9}’,“”,{“message”:“phone is incorrect”}) phone: string;

after regex pattern we need pass empty string and third argument be our message