Question

I need to validate a text based upon a regular expression in javascript. My regular expression is working fine but but can’t find out why it is not working in java script.

The regular expression is this , ^([-+/*]\d+(\.\d+)?)*

Valid expressions are +7 or +9.36*8 or +4-9.3/5.0

Invalid matches are test or 8.36

Here is the code,

    var ck_diffrentialformula = /^([-+/*]\d+(\.\d+)?)*/;

            function radtxtbxLinkedDifferentialFormulaOnBlur(sender, eventArgs) {
                if (sender.get_value().length > 0) {

                    var entered_value = sender.get_value();

                    if (ck_diffrentialformula.test(entered_value)) {
                     alert('Text Matches');
                    }
                    else {
                     alert('Text does not match');
                    }
                }
            }

sender.get_value() - gives the text box value over here.

Please tell me where I am doing wrong.

Answer 1

Maybe you want to try this expression: /^([\-+\/*]\d+(\.\d+)?)*$/
It escapes “-” and “/” (jsbin suggests it) within the regex and considers the whole string ($ at the end).