Exploring the New Features of Angular 13 with Typescript, Regular Expressions, and

Question

Exploring the New Features of Angular 13 with Typescript, Regular Expressions, and

Currently, I am working on an Angular 13 project and I am trying to create a directive that will only allow users to type numbers and '/' in my date input field format of dd/mm/yyyy. Below is the regular expression (Regx) that I am using:

if (!String(myVal).match(new RegExp(/^\d+$/))) {
        event.preventDefault();
    }

Although this condition is functioning correctly, it restricts me from typing the '/' character needed for formatting dates. Does anyone have any suggestions on how I can modify my Regx to allow both numbers and the '/' character?

Thank you.

angular typescript

Answer 1

Answer №1

Regex allows you to only input numbers because of the pattern ^\d+$, which specifically targets numbers. For validating a final date with Regex, it should resemble this:

"01/06/2022".match(/^\d{2}\/\d{2}\/\d{4}$/)

Here's a breakdown:

^ marks the beginning of the string
\d{2} signifies two digit matches
\d{4} represents four digit matches
\/ is an escaped forward slash (/) and requires escaping
$ denotes the end of the string
No need for instantiating new RegExp as Regex is automatically defined within the two / symbols.

For limiting character input specifically to those used in dates, the Regex would be:

"01/06".match(/^[\d\/]+$/)

This translates to "only match when at least one (indicated by +) of the characters between [ and ] are present: either digits (\d) or /."

It's important to note that alternative methods exist for validating a completely typed date aside from using Regex, as the Regex could potentially allow dates like 99/99/9999.

Answer 2

Regex allows you to only input numbers because of the pattern ^\d+$, which specifically targets numbers. For validating a final date with Regex, it should resemble this:

"01/06/2022".match(/^\d{2}\/\d{2}\/\d{4}$/)

Here's a breakdown:

^ marks the beginning of the string
\d{2} signifies two digit matches
\d{4} represents four digit matches
\/ is an escaped forward slash (/) and requires escaping
$ denotes the end of the string
No need for instantiating new RegExp as Regex is automatically defined within the two / symbols.

For limiting character input specifically to those used in dates, the Regex would be:

"01/06".match(/^[\d\/]+$/)

This translates to "only match when at least one (indicated by +) of the characters between [ and ] are present: either digits (\d) or /."

It's important to note that alternative methods exist for validating a completely typed date aside from using Regex, as the Regex could potentially allow dates like 99/99/9999.

Exploring the New Features of Angular 13 with Typescript, Regular Expressions, and

Answer №1

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