The last metacharacters we will cover in detail here are the ^ and $ metacharacters, used to match the beginning and end of line, respectively. By using a ^ at the beginning of your regex, you can cause your pattern to be "anchored" to the start of the line. In the following example, we use the ^# regex to match any line beginning with the # character:

$ grep ^# /etc/fstab
# /etc/fstab: static file system information.
#