# Input  : The rain in Seattle.
# Output : The hail in Seattle.
"The rain in Seattle" -replace 'rain', 'hail'

##
#  ^  -> the first character
#  [] -> choose one char to match
#  \\w -> match a-z, A-Z, 0-9, and '_'
#  .  -> except '\\n', match any other characters.
#  +  -> 'char'+, match the max character as if it is possible.
#  () -> Group -> placing group contents in $1. 
#  $  -> the last character
##

# output: email.com
"[email protected]" -replace '^[\\w]+@(.+)$', '$1'