Create regular expression for custom number format in JavaScript

Question

How can i create regex for the number format 2131213423var regex  new RegExp34091309309734if regextestdocumentgetElementById34txtFax34value     alert34Valid34 else     alert34invalid34I have tried to above code but its failed

dharmendr · Accepted Answer

Hi azzimkazziRefer below exampleHTMLlthtmlgtltheadgt    ltmeta charset34utf834 gt    lttitlegtlttitlegt    ltscript type34textjavascript34gt        function Validate             var regex  new RegExp3409309309434            if regextestdocumentgetElementById34txtFax34value                 alert34Valid34             else                 alert34invalid34                        ltscriptgtltheadgtltbodygt    ltinput type34text34 id34txtFax34 onchange34Validate34 gtltbodygtlthtmlgtDemo

Create regular expression for custom number format in JavaScript

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