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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.
Integer.valueOf() is another useful method to convert String to Integer in Java, it offers caching of Integers from -128 to 127. Internally, valueOf() also calls parseInt() method for String to int conversion. In this Java programming tutorial, we will see all three ways to convert String to int value in Java.