User Guide : Using Content Extraction Language : Language Syntax and Examples : # comment
 
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# comment
Except when used in a regular expression, anything from # (pound sign) to the end of the line is considered a comment, and is ignored. If the pound sign ( # ) is within forward slashes ( /#/ ), then the regular expression will match a literal #.
Example
# Comments can appear on a line by themselves or to the right of statements
Example
varlen = length($3);
# Every line in a script can contain a comment if useful