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.

Type:

ValidationRuleType