Angular Validator - PatternRule

A validation rule that requires that the validated field match a specified pattern.

import { PatternRule } from "devextreme/common"
Type:

Object

To specify the regular expression that the validated field must match, set the rule's pattern configuration property.

View Demo

NOTE
If you apply a pattern rule to a DateBox component, specify dateSerializationFormat so that the format of the validated value is a string.
See Also

ignoreEmptyValue

If set to true, empty values are valid.

Type:

Boolean

Default Value: true

message

Specifies the message that is shown if the rule is broken.

Type:

String

Default Value: 'Value does not match pattern'

An error message can be specified as follows:

  • Hard-code the message

    jQuery
    index.js
    $(function() {
        $("#textBox").dxTextBox({ ... })
            .dxValidator({
                type: "pattern",
                message: "My custom message"
            });
    });
    Angular
    app.component.html
    app.module.ts
    <dx-text-box> 
        <dx-validator>
            <dxi-validation-rule 
                type="pattern" 
                message="My custom message">
            </dxi-validation-rule>
        </dx-validator>
    </dx-text-box>
    import { BrowserModule } from '@angular/platform-browser';
    import { NgModule } from '@angular/core';
    import { AppComponent } from './app.component';
    
    import { DxValidatorModule,
             DxTextBoxModule } from 'devextreme-angular';
    
    @NgModule({
        declarations: [
            AppComponent
        ],
        imports: [
            DxTextBoxModule,
            BrowserModule,
            DxValidatorModule
        ],
        providers: [],
        bootstrap: [AppComponent]
    })
    export class AppModule { }
    Vue
    App.vue
    <template>
        <DxTextBox>
            <DxValidator>
                <DxPatternRule
                    message="My custom message"
                />
            </DxValidator>
        </DxTextBox>
    </template>
    
    <script>
    import 'devextreme/dist/css/dx.light.css';
    
    import { DxTextBox } from 'devextreme-vue/text-box';
    import {
        DxValidator,
        DxPatternRule
    } from 'devextreme-vue/validator';
    
    export default {
        components: {
            DxTextBox,
            DxValidator,
            DxPatternRule
        }
    }
    </script>
    React
    App.js
    import React from 'react';
    
    import 'devextreme/dist/css/dx.light.css';
    
    import { TextBox } from 'devextreme-react/text-box';
    import {
        Validator,
        PatternRule
    } from 'devextreme-react/validator';
    
    class App extends React.Component {
        render() {
            return (
                <TextBox>
                    <Validator>
                        <PatternRule
                            message="My custom message" />
                    </Validator>
                </TextBox>
            );
        }
    }
    export default App;
  • Hide the message

    jQuery
    index.js
    $(function() {
        $("#textBox").dxTextBox({ ... })
            .dxValidator({
                type: "pattern",
                message: ""
            });
    });
    Angular
    app.component.html
    app.module.ts
    <dx-text-box>
        <dx-validator>
            <dxi-validation-rule 
                type="pattern" 
                message="">
            </dxi-validation-rule>
        </dx-validator>
    </dx-text-box>
    import { BrowserModule } from '@angular/platform-browser';
    import { NgModule } from '@angular/core';
    import { AppComponent } from './app.component';
    
     import { DxValidatorModule,
              DxTextBoxModule } from 'devextreme-angular';
    
    @NgModule({
        declarations: [
            AppComponent
        ],
        imports: [
            BrowserModule,
            DxValidatorModule,
            DxTextBoxModule
        ],
        providers: [],
        bootstrap: [AppComponent]
    })
    export class AppModule { }
    Vue
    App.vue
    <template>
        <DxTextBox>
            <DxValidator>
                <DxPatternRule
                    message=""
                />
            </DxValidator>
        </DxTextBox>
    </template>
    
    <script>
    import 'devextreme/dist/css/dx.light.css';
    
    import { DxTextBox } from 'devextreme-vue/text-box';
    import {
        DxValidator,
        DxPatternRule
    } from 'devextreme-vue/validator';
    
    export default {
        components: {
            DxTextBox,
            DxValidator,
            DxPatternRule
        }
    }
    </script>
    React
    App.js
    import React from 'react';
    
    import 'devextreme/dist/css/dx.light.css';
    
    import { TextBox } from 'devextreme-react/text-box';
    import {
        Validator,
        PatternRule
    } from 'devextreme-react/validator';
    
    class App extends React.Component {
        render() {
            return (
                <TextBox>
                    <Validator>
                        <PatternRule
                            message="" />
                    </Validator>
                </TextBox>
            );
        }
    }
    export default App;
  • Display the editor's name in the message

    jQuery
    index.js
    $(function() {
        $("#textBox").dxTextBox({ ... })
            .dxValidator({
                name: "Phone number", // The error message will be "Phone number does not match pattern"
                validationRules: [{
                    type: "pattern"
                }]
            });
    });
    Angular
    app.component.html
    app.module.ts
    <dx-text-box>
        <!-- The error message will be "Phone number does not match pattern" -->
        <dx-validator name="Phone number">
            <dxi-validation-rule 
                type="pattern">
            </dxi-validation-rule>
        </dx-validator>
    </dx-text-box>
    import { BrowserModule } from '@angular/platform-browser';
    import { NgModule } from '@angular/core';
    import { AppComponent } from './app.component';
    
    import { DxValidatorModule,
             DxTextBoxModule } from 'devextreme-angular';
    
    @NgModule({
        declarations: [
            AppComponent
        ],
        imports: [
            BrowserModule,
            DxValidatorModule,
            DxTextBoxModule
        ],
        providers: [],
        bootstrap: [AppComponent]
    })
    export class AppModule { }
    Vue
    App.vue
    <template>
        <DxTextBox>
            <!-- The error message will be "Phone number does not match pattern" -->
            <DxValidator name="Phone number">
                <DxPatternRule />
            </DxValidator>
        </DxTextBox>
    </template>
    
    <script>
    import 'devextreme/dist/css/dx.light.css';
    
    import { DxTextBox } from 'devextreme-vue/text-box';
    import {
        DxValidator,
        DxPatternRule
    } from 'devextreme-vue/validator';
    
    export default {
        components: {
            DxValidator,
            DxPatternRule
        }
    }
    </script>
    React
    App.js
    import React from 'react';
    
    import 'devextreme/dist/css/dx.light.css';
    
    import { TextBox } from 'devextreme-react/text-box';
    import {
        Validator,
        PatternRule
    } from 'devextreme-react/validator';
    
    class App extends React.Component {
        render() {
            return (
                <TextBox>
                    {/* The error message will be "Phone number does not match pattern" */}
                    <Validator name="Phone number">
                        <PatternRule} />
                    </Validator>
                </TextBox>
            );
        }
    }
    
    export default App;

pattern

Specifies the regular expression that the validated value must match.

Type:

RegExp

|

String

NOTE

If your pattern is a string, escape the backslash. For example, the following pattern matches a character other than white space:

pattern: '\\S'

type

Specifies the rule type. Set it to "pattern" to use the PatternRule.