Vuejs using regular expersion in mount method with $emit

Question

with this below code i can observe to parent component to get data from that, this code work fine without any problem:

    mounted() {
        this.$emit('caption', this.$el.innerText);
    }

now i want to use replace method to make hashtag from received texts, for example:

    mounted() {
        this.$emit('caption', this.$el.innerText.replace('/#([\pL\pN_-]+)/u', 
               '<a href="https://www.instagram.com/explore/tags/$1" target="_blank">#$1</a>'))
    }

this code with replace method is not correct and i'm not sure how can resolve that. how can i receive data from parent with $emit and use replace method to make a simple hashtag?