How to below a regex for choosing a single digit in angular forms sync validator

Asked Jan 16 '20 at 13:12

Active Jan 16 '20 at 13:12

Viewed 16 times

I am currently using the following regex pattern:

Validators.pattern("^[1-4]*$")

What I am trying to accomplish is to produce a valid state if the digits 1-4 are entered and invalid state if anything else is submitted. Thing is, if I submit let's say 11, it still counts it as valid. How do I need to change the regex around to meet the above requirements?

asked Jan 16 '20 at 13:12

Yoav Kochman

You can omit the quantifier `*` to match a single digit from 1 to 4 `^[1-4]$` – The fourth bird Jan 16 '20 at 13:14
`Validators.pattern("[1-4]")` will only match a string consising of one char, `1`, `2`, `3` or `4`. Anchors are added by default for string patterns by the `Validators.pattern` code. – Wiktor Stribiżew Jan 16 '20 at 13:15

How to below a regex for choosing a single digit in angular forms sync validator

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