Such string pattern is a regular expression that allows or prohibits parsing of a string.
Example 28.1. String Format
If an input file contains a string field and Format property is \\w{4}
for this field,
only the string whose length is 4 will be parsed.
Thus, when a Format property is specified for a string,
Data policy may cause fail of the graph (if Data policy is Strict
).
If Data policy is set to Controlled
or Lenient
,
the records in which this string value matches the specified Format property are read, the others are skipped
(either sent to Console or to the rejected port).