CODEWITHSUNDEEP
phpregex
GGu
GGu

Reputation: 81

Checking String only letters and numbers except both

"Hello" returns true
"12345" returns true
"Hello1" returns false
"123H" returns false

regex can possible check only letters and numbers except both?
or
Check function of PHP?

Upvotes: 0

Views: 54

Answers (3)

vks
vks

Reputation: 67968

^(?=(?:\d+|[a-zA-Z]+)$)[a-zA-Z0-9]+$

Another variation.See demo.

https://regex101.com/r/sH8aR8/11

$re = "/^(?=(?:\\d+|[a-zA-Z]+)$)[a-zA-Z0-9]+$/m";
$str = "Hello\n12345\nHello1\n123H";

preg_match_all($re, $str, $matches);

Upvotes: 1

npinti
npinti

Reputation: 52185

You could use something like so: ^([A-Za-z]+)|([0-9]+)$. This will make sure that the string is either full of letters exclusively, or numbers exclusively, but not both.

You can check the regular expression here.

Upvotes: 2

Ariel
Ariel

Reputation: 26753

Regex:

/^[A-za-z]*|[0-9]*$/

Check for start of line, then any numbers of letter OR any number of numbers, then end of line.

A blank line will return true. If that's a problem change the * to a +.

Upvotes: 2

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