How to Specify Single Quote in Regular Expression

Try this:

/^[A-Za-z\/\s\.'\-]+$/;

You do not need to backslash/escape the single quote. Doing so will cause Safari to disallow single quote marks instead of allowing them.

var testName=/^[A-Za-z\/\s\.'-]+$/;
var name= $("#name").val();
if(testName.test(name) == false || name == "")
{}

This is a code I used to check name

/^[A-Za-z\/\s\.'-]+$/

@Urasquirrel - you asked for detailed explanation and I know that whenever I see questions like this, I want the same thing!!

^ - beginning of the string 
[ - allowed characters are contained in the square brackets
A-Z - uppercase A to Z
a-z - lowercase a to z
\/ - escaped forward slash
\s - whitespace
\. - escaped period
' - single quote
- - a dash
] - end of square brackets
+ - ONE of more of the allowed characters contained in the square brackets
$ - end of string

is a great place to test different RE patterns with different strings and different languages. there are other sites that do similar