#!/bin/bash
s='#greenऔर
<सेमीकोलन>
actionएक्शनmysql
admin2को'
perl -CSD -Mutf8 -pe 's/(?<=[अ-ह\p{M}])(?=[^अ-ह\p{M}])|(?<=[^अ-ह\p{M}])(?=[अ-ह])/ /g' <<< "$s"