function hasNumber( str ){ return /\d/.test( str ); } results:
hasNumber(0) // true hasNumber("0") // true hasNumber(2) // true hasNumber("aba") // false hasNumber("a2a") // true While the above will return *truthy* as soon the function encounters a (simgle)**one** *Number* `\d` if you want to be able return**return an Array of the matched resultsresults**:
function hasNumber( str ){ return str.match( /\d+/g ); } results:
hasNumber( "11a2 b3 c" ); // ["11", "2", "3"] hasNumber( "abc" ); // null if( hasNumber( "a2" ) ) // "truthy statement" where + in /\d+/g is to match one or more Numbers (therefore the "11" in the above result) and the g Global RegExp flag is to continue iterating till the end of the passed string.
Advanced_Searching_With_Flags
RegExp.prototype.test()
String.prototype.match()