String that is enclosed within parenthesis ( )


        
            
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Site: https://regex101.com/

Expression:
[\(]{1,}[^)]*[)]{1,}
Example text:
oi
(oi)
oi(oi)

Javascript
var re = /[\(]{1,}[^)]*[)]{1,}/;
var term1 = "oi";
var term2 = "(oi)";
var term3 = "oi(oi)";

if (re.exec(term1)) {
    console.log("term1 Valid");
}
else {
    console.log("term1 Invalid");
}

if (re.exec(term2)) {
    console.log("term2 Valid");
}
else {
    console.log("term2 Invalid");
}

if (re.exec(term3)) {
    console.log("term3 Valid");
}
else {
    console.log("term3 Invalid");
}