php - How should I proceed to capitalize the first letter of a filter when it is on the beginning of the sentence?

Question

I have some filters on my forums, something like: when a user posts "hello" the filter modifies the word to "ohai!".

But when a user posts Hello the filter still modify the word to "ohai!", not "Ohai!".

I know this is fixed using regex, but I don't know how.

Answer 1

如果你使用 PHP，你可以使用 ucfirst(); （大写首字母）

例如：

$filter= "ohai";
echo ucfirst($filter);