php - Regexp - How to check whether a string starts OR ends with given character? -

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string start , ends character should not match.

is easiest like:

$string = '!test'; preg_match('/^(!?)([a-z0-9]{1,10})(!?)$/i', $string, $matches);

and examine $matches?

if have 1 character @ beginning or end, it's simple saying this:

/^!|!$/

no need capture group.

update: make sure either an exclamation mark , ten letters or ten letters , exclamation mark, build pattern this:

/^!?[a-z0-9]{1,10}$|^[a-z0-9]{1,10}!?$/

it looks it's repeating itself, it's way cheaper , faster having 3 capture groups.

i put a unit test in regex101 this.


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