This is validation to check that entered values are all letters or combination of different chars.Following script will compile the idea of validation for all letters.
The previous errata for this document, are also available. This document is also available in these non-normative formats: XML and XHTML with color-coded revision indicators.
Copyright © 2008 The Extensible Markup Language (XML) is a subset of SGML that is completely described in this document.
However for the sake of simplicity, regular expressions are string combinations that are used to quickly match specific patterns in a body of text.
The one we need is The two methods above have a significant limitation, they suppress keystrokes that are not numbers but are perfectly valid, for example Backspace, Delete, Ctrl C, etc.
Figure 1: Above figure is output of validation of empty field In above script, function Empty will check that the HTML input that is being send to the server has something in it.