Using AngularJS for pattern matching and validation with regular expressions

Question

Using AngularJS for pattern matching and validation with regular expressions

For the form validation in my AngularJS application, I am in need of regular expressions for two specific patterns with certain conditions.

Pattern 1:

The input box should only accept alphanumeric characters with no spaces. Additionally, users should be able to use special characters like ~!@#$-_ anywhere in the string, but none of the other characters such as (%, &, ^) should be allowed. Leading and trailing whitespaces are also not permitted.

Examples:

 ab@4_w    : Valid
 sd!tye123  : Valid
 sd%tye123  : Invalid
 sd*tye123  : Invalid

$scope.pattern1 = [\w~!@#\$-]+

Pattern 2: This pattern should only allow alphanumeric characters without spaces or underscores (_). No other characters are permitted, and leading/trailing whitespaces are not allowed.

Examples:

  a4hgg5  : Valid
  a4_6hy   : Invalid
  a@yb    : Invalid

$scope.pattern2 = [\w]+

In order to meet the requirements mentioned above, adjustments need to be made to $scope.pattern1 and $scope.pattern2.

javascript angularjs regex ng-pattern angularjs-ng-pattern

Answer 1

Answer №1

Ensure that leading and trailing whitespace is not allowed.

To achieve this, include the ng-trim="false" attribute in the input element.

The input field should only accept alphanumeric characters without spaces. Additionally, users should be able to use special characters like ~!@#$-_ anywhere in the string. Make sure to restrict all other characters such as (%, &, ^, etc).

Your current pattern is correct, however, it is recommended not to escape unnecessary characters. You can use:

^[\\w~!@#$-]+$

Here, \w matches [a-zA-Z0-9_].

NOTE: If you pass the pattern as a string, do not include the ^ and $ anchors. Instead, double the backslashes: "[\\w~!@#$-]+".

It should only allow alphanumeric characters with no spaces, and exclude the underscore (_) character.

A simpler pattern for this requirement is: ^[a-zA-Z]+$. The same anchoring rules mentioned above apply.

Answer 2

Ensure that leading and trailing whitespace is not allowed.

To achieve this, include the ng-trim="false" attribute in the input element.

The input field should only accept alphanumeric characters without spaces. Additionally, users should be able to use special characters like ~!@#$-_ anywhere in the string. Make sure to restrict all other characters such as (%, &, ^, etc).

Your current pattern is correct, however, it is recommended not to escape unnecessary characters. You can use:

^[\\w~!@#$-]+$

Here, \w matches [a-zA-Z0-9_].

NOTE: If you pass the pattern as a string, do not include the ^ and $ anchors. Instead, double the backslashes: "[\\w~!@#$-]+".

It should only allow alphanumeric characters with no spaces, and exclude the underscore (_) character.

A simpler pattern for this requirement is: ^[a-zA-Z]+$. The same anchoring rules mentioned above apply.

Answer 3

Answer №2

Give it a shot

^[\w~!@#\$-]+$

Explanation

^ Indicates the start of the string
[\w~!@#\$-]+ Represents any combination of the specified characters (note the need to escape $ like \$)
$Denotes the end of the string

Check it out in Action on Regex101. To allow empty strings, use * instead of + for the quantifier. Also, using \w eliminates the need for the i flag since it covers both uppercase and lowercase letters.

Answer 4

Give it a shot

^[\w~!@#\$-]+$

Explanation

^ Indicates the start of the string
[\w~!@#\$-]+ Represents any combination of the specified characters (note the need to escape $ like \$)
$Denotes the end of the string

Check it out in Action on Regex101. To allow empty strings, use * instead of + for the quantifier. Also, using \w eliminates the need for the i flag since it covers both uppercase and lowercase letters.

Using AngularJS for pattern matching and validation with regular expressions

Answer №1

Answer №2

Explanation

Similar questions

Is there a way to generate a histogram showcasing the frequencies of particular patterns found within a FASTA file?

Hiding a HubSpot form is made easy with the utilization of vue.js and its

Is it possible to customize the selected color of the Chip component?

Clicking on the "Select All" option in the angular2-multiselect-dropdown triggers the onDeSelectAll event

Centering a JavaScript object within a div

Express and Mongoose error handling improvements for updates and puts

Searching for an array of strings in an express.js application

Tips for reorganizing the JSON data created by Artoo.js?

Accessing a variable outside of the function call in AngularJS is not possible

What could be causing my $q resolution and promise to not function as expected?

The conversation refusing to end

Encountering issue: Unrecognized parameter "id" in the "user" field of type "Query" [GraphQL, Relay, React]

jQuery Slider not appearing on the page

I am facing an issue with Angular 14 and Webpack 5, where certain unnecessary nodejs modules seem to be hindering me from successfully serving

Using AngularJS to filter JSON data that is active

"Unraveling the Mystery of jQuery In

Canvas - Drawing restricted to new tiles when hovered over, not the entire canvas

A helpful guide on passing a component as a prop to a child class and incorporating it within the child component along with additional props

Node.js client-side code

Consider creating a distinct document for your "scripts"