### 9.4 Searching Source Files

There are two commands for searching through the current source file for a regular expression.

`forward-search regexp`
`search regexp`

  The command ‘`forward-search regexp`’ checks each line, starting with the one following the last line listed, for a match for regexp. It lists the line that is found. You can use the synonym ‘`search regexp`’ or abbreviate the command name as `fo`.

`reverse-search regexp`

  The command ‘`reverse-search regexp`’ checks each line, starting with the one before the last line listed and going backward, for a match for regexp. It lists the line that is found. You can abbreviate this command as `rev`.