diff --git a/src/app/components/keyfilter/keyfilter.ts b/src/app/components/keyfilter/keyfilter.ts
index 1295bb2a572..89206a8f026 100755
--- a/src/app/components/keyfilter/keyfilter.ts
+++ b/src/app/components/keyfilter/keyfilter.ts
@@ -231,8 +231,9 @@ export class KeyFilter implements Validator {
         }
 
         let valueCheck = this.el.nativeElement.value || '';
-
-        let val = valueCheck + cc;
+        const selectionStart = (<HTMLInputElement>e.currentTarget).selectionStart || 0;
+        const selectionEnd = (<HTMLInputElement>e.currentTarget).selectionEnd || 0;
+        let val = valueCheck.substring(0, selectionStart) + cc + valueCheck.substring(selectionEnd);
 
         ok = (<RegExp>this.regex).test(val);