javascript - Error when using String.search("sinh(2"): "Invalid regular expression" - Stack

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I have problem as below:

var test = $("#k_w").val().search("sinh("+parseFloat(sinh_array[i]));

The debugger shows an error: Uncaught SyntaxError: Invalid regular expression: /sinh(2/: Unterminated group.

sinh_array[i] are numbers.

What's wrong?

I have problem as below:

var test = $("#k_w").val().search("sinh("+parseFloat(sinh_array[i]));

The debugger shows an error: Uncaught SyntaxError: Invalid regular expression: /sinh(2/: Unterminated group.

sinh_array[i] are numbers.

What's wrong?

• javascript
• syntax-error

Share Improve this question Follow edited Mar 18, 2012 at 21:14 Rob W 349k8787 gold badges807807 silver badges682682 bronze badges asked Mar 18, 2012 at 13:09 Marcin KostrzewaMarcin Kostrzewa 59544 gold badges1111 silver badges2424 bronze badges

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3 Answers 3

Sorted by: Reset to default 6

The String.search method converts the first argument to a Regular expression.

You are looking for the String.indexOf method, which search for a string, without a conversion to a RegExp.

var test = $("#k_w").val().indexOf("sinh("+parseFloat(sinh_array[i]));
//                         ^^^^^^^ indexOf

You have an opening parenthesis in your regex, but no closing parenthesis.

I think what you really want is this:

var test = $("#k_w").val().search("sinh\\("+parseFloat(sinh_array[i]) + "\\)");

I suspect you want to match the actual parens, and not create a group.

You have to escape parentheses in regexps; otherwise they begin a match group and thus have to be closed again.

var test = $("#k_w").val().search("sinh\\("+parseFloat(sinh_array[i]));

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