sed -i -E "s/еж([аиу][^а-я])/ёжик\1/g" *ru*
grep -E "еж[аиу][^а-я]" *ru*
Comment: [^а-я] includes all spaces and punctuation and also finish of string
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingBottom="3dp"
android:paddingLeft="5dp"
android:paddingRight="3dp"
android:paddingTop="3dp" >
<ListView
android:id="@android:id/list"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:cacheColorHint="@android:color/transparent" />
<TextView
android:id="@id/android:empty"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:gravity="center"
android:text="@string/no_teams_in_list" />
<Button
android:id="@+id/addTeamButton"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/button"
android:text="@string/teamlist_addteam" />
</LinearLayout>