| 19 |  | are supported. | 
| 20 |  | .SS Notes | 
| 21 |  | .IP \(bu | 
| 22 | < | Basic regular expressions (original grep) are used. | 
| 22 | > | Basic regular expressions (original grep) are used with the addition | 
| 23 | > | of "\\<" for beginning of word and "\\>" for end-of-word. | 
| 24 |  | .IP \(bu | 
| 25 |  | .I x | 
| 26 |  | and | 
| 43 |  | Any character except '#' may be used to delimit the light source name | 
| 44 |  | regular expression; '/' is conventional, but not required. | 
| 45 |  | .IP \(bu | 
| 46 | + | Regular expressions may contain '\\' followed by the delimiter | 
| 47 | + | character; aliases may contain '\\' followed by ')'. | 
| 48 | + | .IP \(bu | 
| 49 |  | Comments begin with '#' and may occur at the end of any line. | 
| 50 |  | .IP \(bu | 
| 51 |  | Blank lines are ignored. |