User Guide : Using Content Extraction Language : Language Syntax and Examples : clearvars;
 
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clearvars;
A statement that sets variables to their appropriate initial values. Numeric variables are set to 0 and string variables are set to empty string. Built-in variables are not changed.
Example
# initializes all variables each time the input line contains the string "Company:"
$0(3 10) ~ /Company:/ { clearvars; coname = trim($0(12 80)); }