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var numericString = testString.replace(/[^0-9]/g, ''); return numericString; }. This function uses the replace method and the /[^0-9]/g,'' Regular Expression to remove non-numeric characters from the testString variable passed in the parameter list.Save the document and launch your browser. Open the document in your browser.ips & Warnings. 1  This example runs the removeNonNumeric function when the Web page loads. 2  Remove the first three lines of code before that function to stop that from happening. 3  To use the function in production, call the function and pass it a string containing text.
Check your code for any syntax error. A common reason for a void error in Javascript is missing opening or closing brackets ( the { or } character). A quick scan of the code can identify if you are missing brackets or have a syntax error that is triggering Javascript errors in the browser. The best way to check for missing brackets is to find each closing bracket that matches the opening one. Count how many opening brackets there are in your code.