CODEWITHSUNDEEP
javascriptangularjsregex
LocustHorde
LocustHorde

Reputation: 6409

Allow only digits with a single comma or period on ng-pattern

I'm tring to validate a number text box in angular. Only digits, a single comma, or a single dot is accepted. Alphabets and multiple dots or commans are invalid.

My regex is this: 

/\d{1,}[,.]{0,1}\d{0,}/

There are some matching and non matching values here: https://regexr.com/3k4hl if needed.

Valid values: 

1111
1.1111
111.111
111,11
1,1
1

Invalid values: 

 1d11e
 1..1
 1.,1
 1,,1
 111.11.1
 1,111.11

But for whatever reason, angular textbox seems think everything is invalid, except an empty text box. I'm quite confused why: 

<input type="text" ng-model="idNumber" ng-pattern="customPattern" />

// in .js
$scope.customPattern = '\d{1,}[,.]{0,1}\d{0,}';

Is there anything else I need to add?

Thanks.

ps: I'm on angular 1.5x

Upvotes: 2

Views: 4792

Answers (1)

ctwheels
ctwheels

Reputation: 22837

See regex in use here

^\d+(?:[,.]\d+)?$
  • ^ Assert position at the start of the line
  • \d+ Match one or more digits
  • (?:[,.]\d+)? Optionally match the following
    • [,.] Match a character in the set (either , or .)
    • \d+ Match one or more digits
  • $ Assert position at the end of the line

Notes:

  • {1,} is the same as +
  • {0,1} is the same as ?
  • {0,} is the same as *

Upvotes: 6

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