check if input type="text" has a symbol

[sushestvo]

so i have regular input field.
how can i check if use inputs an apostrophe there?
so that if they do, i would alert("them") ?
i hope someone can help.
thanks.

[Philip M]

if (/\'/g.test(thefieldName.value)) {
alert ("You have typed an apostrophe!")
}

[sushestvo]

Originally Posted by Philip M

if (/\'/g.test(thefieldName.value)) {
alert ("You have typed an apostrophe!")
}

Thank you so much!!!