$string="
hi hello @begintobe 
replace @end asas x x x x x zxzxax
hi hello hi hellooo
@beginthis has tobe 
replaced @end" .....

i had @replace=["replacestring1","replacestring2"....]

i need to have my string like.
$string="
hi hello @begin replacestrinjg1 @end asas x x x x x zxzxax
hi hello hi hellooo
@begin replacestring2 @end" .....