<h1 class="cp_h1title"><span>見出しテキスト</span></h1>

.cp_h1title {
  position: relative;
  color: #424242;
  background-color: #ffffff;/*背景色と合わせる*/
  background-image:
    linear-gradient(-45deg,#9e9e9e 25%, transparent 25%,transparent 50%, #9e9e9e 50%,#9e9e9e 75%, transparent 75%,transparent);
  background-size: 10px 10px;
  height: 0.5em;
}
.cp_h1title span {
  position: absolute;
  display: inline-block;
  margin-top: -0.5em;
  margin-left: 0.8em;
  background: #ffffff;/*背景色と合わせる*/
  padding: 0 10px;
}