User Guide : Scripting : Writing Expressions
 
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Writing Expressions
Writing expressions is important if you want to:
Map and manipulate the data from the source to the target file
Select records that meets a certain criteria for the target file (filtering)
You are a novice user and want to
See
Define parts of expressions and types of operators
Specify source field names in expressions
Nest expressions within expressions and set precedence in expressions
Specify literal values (constants) in expressions
Ensure that dates are read properly from the source file and written as required in the target file
 
You are an advanced user and want to
See
Use the correct statement for the job
Use arrays correctly in your expressions
Interpret data typing errors in the expressions
Learn the functions that use regular expressions and the characters that must be used in the functions
Save your script expressions for later use