JS: String.prototype.search

str.search(regex_or_str)

• Return the index of first char of matched string.
• If no match, returns -1.
• If argument is string, it is converted to regex by RegExp

// find digit
console.log("a 34 b".search(/\d/));
// 2

// using string as arg
console.log("a 34 b".search("\\d"));
// 2

// not found
console.log("a 34 b".search("xx"));
// -1