A directive that adds regex pattern validation to controls marked with the
pattern attribute. The regex must match the entire control value. The directive is provided with the
NG_VALIDATORS multi-provider list.
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Tracks changes to the pattern bound to this directive.
The following example shows how to add a pattern validator to an input attached to an ngModel binding.
<input name="firstName" ngModel pattern="[a-zA-Z ]*">
A lifecycle method called when the directive's inputs change. For internal use only.
Method that validates whether the value matches the the pattern requirement.
Registers a callback function to call when the validator inputs change.
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The callback function
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