Set node type to ASSERTION if the character represents an assertion

postfixNode.go

@@ -49,6 +49,9 @@ func newEscapedNode(c rune) postfixNode {
 		toReturn.contents = append(toReturn.contents, slices.DeleteFunc(dotChars(), func(r rune) bool {
 			return slices.Contains(wordChars, r)
 		})...)
+	case 'b', 'B':
+		toReturn.nodetype = ASSERTION
+		toReturn.contents = append(toReturn.contents, c)
 	default: // None of the above - append it as a regular character
 		toReturn.nodetype = CHARACTER
 		toReturn.contents = append(toReturn.contents, c)
@@ -77,6 +80,8 @@ func newPostfixNode(contents ...rune) postfixNode {
 			to_return.nodetype = PIPE
 		case CONCAT:
 			to_return.nodetype = CONCATENATE
+		case '^', '$':
+			to_return.nodetype = ASSERTION
 		default:
 			to_return.nodetype = CHARACTER
 		}