An issue arises when ng-pattern fails to recognize a regular expression

My form includes inline validation for a specific input field.

<form name="coForm" novalidate> 
<div>
   <label>Transaction: </label>
   <input  type="text" name="transaction" class="form-control"
           placeholder="<Direction> <Message Type>, ex.:OUT X12214" 
           ng-model="newco.transaction" 
           ng-pattern=/(^(IN )([A-Za-z0-9 &_]+))|(^(OUT )([A-Za-z0-9 &_]+))/ 
    required>

      <span style="color:red" 
         ng-show="coForm.transaction.$dirty || 
                  coForm.transaction.$invalid">
      <span ng-show="coForm.transaction.$error.pattern">
          Please enter a valid Transaction value
      </span>
      <span ng-show="coForm.transaction.$error.required">
            Transaction is required.
      </span>
</div>
</form>

However, I have encountered an issue where the validation only works for required and not for pattern

Here is the fiddle

For reference, here are some examples that result in a positive match:

OUT X12214
In X12850
IN ARRANT
OUT CORREC&TRANSLEG
OUT TEST_TEST
IN TEST2&TEST2
javascriptregexangularjsng-pattern

Answer №1

Make sure to include double quotes in the ng-pattern attribute and initialize Angular on the page with ng-app.

Code Example:

<form name="coForm" novalidate ng-app="">
    <div>
        <label>Transaction:</label>
        <input type="text" name="transaction" class="form-control" placeholder="<Direction> <Message Type>, ex.:OUT X12214" ng-model="newco.transaction" 
        ng-pattern="/(^(IN )([A-Za-z0-9 &_]+))|(^(OUT )([A-Za-z0-9 &_]+))/" required>   
        <span style="color:red" ng-show="coForm.transaction.$dirty || coForm.transaction.$invalid">
           <span ng-show="coForm.transaction.$error.pattern">Enter correct value for Transaction</span>
            <span ng-show="coForm.transaction.$error.required">Transaction is required.</span>
        </span>
    </div>
</form>

Check out this JsFiddle example.

Answer №2

Choose && over ||

ng-display="formField.valid && 
              formField.completed">

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