Question 198374 in PHP Question posted in
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Php – Regex to must include X digits and not include symbol(s)

I’m trying have regex with the following requirements:

  • can contain any characters (symbols, spaces) except @ symbol
  • but should contains at least 7 digits, but no more than 20 digits

Should not match:

1234 
abxz1234 
a1b2c3 d 
12345678901234567890123456789 
@123456789
1234@56789

Should match:

1234567890   
123. 45678
$sb w77 123456789
((12345. 678
123 456 789
(333) 444-77.33 ext 4422
Tags:

2

Answers


  1. 0

    How about using [^@] and then a simple range on the character length {7,20}, ie

    php > $pattern = '/^[^@]{7,20}$/';
php > var_dump(preg_match($pattern, '123456789012345678901'));
int(0)
php > var_dump(preg_match($pattern, '12345678901234567890'));
int(1)
php > var_dump(preg_match($pattern, '1234567890123456789'));
int(1)
php > var_dump(preg_match($pattern, '1234567890123@56789'));
int(0)
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  2. 0

    You can use ^[^d@]*(?:d[^d@]*){7,20}$.

    • ^ is the start-of-input assertion.
    • $ is the end-of-input assertion.
    • [^d@]* matches any sequence of characters that does not include a digit nor @
    • d matches one digit.
    • (?: ) is a (non-capturing) group so we can add a quantifier to it
    • {7,20} is the quantifier that requires the preceding pattern to repeat at least 7 times and at most 20.
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