A solid nickname regexp
- by iBram
I want a regular expression to validate a nickname: 6 to 36 characters, it should contain at least one letter. Other allowed characters: 0-9 and underscores.
This is what I have now:
if(!preg_match('/^.*(?=\d{0,})(?=[a-zA-Z]{1,})(?=[a-zA-Z0-9_]{6,36}).*$/i', $value)){
echo 'bad';
}
else{
echo 'good';
}
This seems to work, but when a validate this strings for example:
11111111111a is not valid, but it should
aaaaaaa!aaaa is valid, but it shouldn't
Any ideas to make this regexp better?
