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+/**
+ * @class Ext.form.field.VTypes
+ * <p>This is a singleton object which contains a set of commonly used field validation functions.
+ * The validations provided are basic and intended to be easily customizable and extended.</p>
+ * <p>To add custom VTypes specify the <code>{@link Ext.form.field.Text#vtype vtype}</code> validation
+ * test function, and optionally specify any corresponding error text to display and any keystroke
+ * filtering mask to apply. For example:</p>
+ * <pre><code>
+// custom Vtype for vtype:'time'
+var timeTest = /^([1-9]|1[0-9]):([0-5][0-9])(\s[a|p]m)$/i;
+Ext.apply(Ext.form.field.VTypes, {
+    //  vtype validation function
+    time: function(val, field) {
+        return timeTest.test(val);
+    },
+    // vtype Text property: The error text to display when the validation function returns false
+    timeText: 'Not a valid time.  Must be in the format "12:34 PM".',
+    // vtype Mask property: The keystroke filter mask
+    timeMask: /[\d\s:amp]/i
+});
+ * </code></pre>
+ * Another example:
+ * <pre><code>
+// custom Vtype for vtype:'IPAddress'
+Ext.apply(Ext.form.field.VTypes, {
+    IPAddress:  function(v) {
+        return /^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/.test(v);
+    },
+    IPAddressText: 'Must be a numeric IP address',
+    IPAddressMask: /[\d\.]/i
+});
+ * </code></pre>
+ * @singleton
+ */
+Ext.define('Ext.form.field.VTypes', (function(){
+    // closure these in so they are only created once.
+    var alpha = /^[a-zA-Z_]+$/,
+        alphanum = /^[a-zA-Z0-9_]+$/,
+        email = /^(\w+)([\-+.][\w]+)*@(\w[\-\w]*\.){1,5}([A-Za-z]){2,6}$/,
+        url = /(((^https?)|(^ftp)):\/\/([\-\w]+\.)+\w{2,3}(\/[%\-\w]+(\.\w{2,})?)*(([\w\-\.\?\\\/+@&#;`~=%!]*)(\.\w{2,})?)*\/?)/i;
+
+    // All these messages and functions are configurable
+    return {
+        singleton: true,
+        alternateClassName: 'Ext.form.VTypes',
+
+        /**
+         * The function used to validate email addresses.  Note that this is a very basic validation -- complete
+         * validation per the email RFC specifications is very complex and beyond the scope of this class, although
+         * this function can be overridden if a more comprehensive validation scheme is desired.  See the validation
+         * section of the <a href="http://en.wikipedia.org/wiki/E-mail_address">Wikipedia article on email addresses</a>
+         * for additional information.  This implementation is intended to validate the following emails:<tt>
+         * 'barney@example.de', 'barney.rubble@example.com', 'barney-rubble@example.coop', 'barney+rubble@example.com'
+         * </tt>.
+         * @param {String} value The email address
+         * @return {Boolean} true if the RegExp test passed, and false if not.
+         */
+        'email' : function(v){
+            return email.test(v);
+        },
+        /**
+         * The error text to display when the email validation function returns false.  Defaults to:
+         * <tt>'This field should be an e-mail address in the format "user@example.com"'</tt>
+         * @type String
+         */
+        'emailText' : 'This field should be an e-mail address in the format "user@example.com"',
+        /**
+         * The keystroke filter mask to be applied on email input.  See the {@link #email} method for
+         * information about more complex email validation. Defaults to:
+         * <tt>/[a-z0-9_\.\-@]/i</tt>
+         * @type RegExp
+         */
+        'emailMask' : /[a-z0-9_\.\-@\+]/i,
+
+        /**
+         * The function used to validate URLs
+         * @param {String} value The URL
+         * @return {Boolean} true if the RegExp test passed, and false if not.
+         */
+        'url' : function(v){
+            return url.test(v);
+        },
+        /**
+         * The error text to display when the url validation function returns false.  Defaults to:
+         * <tt>'This field should be a URL in the format "http:/'+'/www.example.com"'</tt>
+         * @type String
+         */
+        'urlText' : 'This field should be a URL in the format "http:/'+'/www.example.com"',
+
+        /**
+         * The function used to validate alpha values
+         * @param {String} value The value
+         * @return {Boolean} true if the RegExp test passed, and false if not.
+         */
+        'alpha' : function(v){
+            return alpha.test(v);
+        },
+        /**
+         * The error text to display when the alpha validation function returns false.  Defaults to:
+         * <tt>'This field should only contain letters and _'</tt>
+         * @type String
+         */
+        'alphaText' : 'This field should only contain letters and _',
+        /**
+         * The keystroke filter mask to be applied on alpha input.  Defaults to:
+         * <tt>/[a-z_]/i</tt>
+         * @type RegExp
+         */
+        'alphaMask' : /[a-z_]/i,
+
+        /**
+         * The function used to validate alphanumeric values
+         * @param {String} value The value
+         * @return {Boolean} true if the RegExp test passed, and false if not.
+         */
+        'alphanum' : function(v){
+            return alphanum.test(v);
+        },
+        /**
+         * The error text to display when the alphanumeric validation function returns false.  Defaults to:
+         * <tt>'This field should only contain letters, numbers and _'</tt>
+         * @type String
+         */
+        'alphanumText' : 'This field should only contain letters, numbers and _',
+        /**
+         * The keystroke filter mask to be applied on alphanumeric input.  Defaults to:
+         * <tt>/[a-z0-9_]/i</tt>
+         * @type RegExp
+         */
+        'alphanumMask' : /[a-z0-9_]/i
+    };
+})());