Within the ng-pattern attribute, we can define a specific pattern for a field to match.
Is there a way to indicate that the field should NOT match the specified pattern?
For instance:
<input type="text" ng-pattern="/[*|\":<>[\]{}`()';@&$]/" />
In this case, I intend for the field not to conform to the pattern. Instead, I want an error to be displayed if the pattern is matched.
To reverse the effect of the regular expression, you can employ a negative lookahead ((?!pattern)):
ng-pattern="/(?![*|\":<>[\]{}`()';@&$])/"
If you want to determine whether a string lacks a specific substring, you can employ a lookahead anchored to the start of the string:
/^(?!.*[*|\x22:<>[\]{}`()';@&$])/
For AngularJS, if a RegExp object is used (the one enclosed in delimiters), the pattern does not need to cover the entire string. Therefore, this regex is suitable for the current requirement of verifying a condition as true or false.
Keep in mind that the commonly suggested tempered greedy token solution
^(?:(?![*|\x22:<>\[\]{}`()';@&$]).)*$Additionally, using \x22 to match a double quote in the ng-pattern value is recommended.
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