tPatternExtract Standard properties

Schema and Edit schema

A schema is a row description. It defines the number of fields (columns) to be processed and passed on to the next component. When you create a Spark Job, avoid the reserved word line when naming the fields.

Built-In: You create and store the schema locally for this component only.

Repository: You have already created the schema and stored it in the Repository. You can reuse it in various projects and Job designs.

Column to check

Select the column you want to analyze.

PROPERTY

The pattern against which you want to check the data is either Built-in or stored remotely in the Repository.

Built-in: You can enter a pattern regex in the Pattern Regex field and store it locally for this component only.

Repository: From the Pattern Selector, select the pattern against which you want to check the data.

These patterns are retrieved from the DQ Repository of Talend Studio. The list includes the system and user-defined patterns.

tStat Catcher Statistics

Select this check box to collect log data at the component level.

Global Variables

NB_LINE: the number of rows read by an input component or transferred to an output component. This is an After variable and it returns an integer.

NB_LINE_OK: the number of rows matching a given pattern. This is an After variable and it returns an integer.

NB_LINE_REJECT: the number of rows not matching a given pattern. This is an After variable and it returns an integer.

ERROR_MESSAGE: the error message generated by the component when an error occurs. This is an After variable and it returns a string. This variable functions only if the Die on error check box is cleared, if the component has this check box.

A Flow variable functions during the execution of a component while an After variable functions after the execution of the component.

To fill up a field or expression with a variable, press Ctrl + Space to access the variable list and choose the variable to use from it.

For further information about variables, see Talend Studio User Guide.

Usage rule

This component is usually used as an intermediate component, and it requires an input component and an output component.

Limitation

When exporting a Job using tPatternExtract with a user-defined pattern stored in the DQ Repository, you must export the pattern with the Job. Otherwise, the pattern will switch to Built-in mode when importing the Job in another project.

When importing a Job using tPatternExtract with a system pattern, the pattern will switch to Built-in mode.

For more information about importing Jobs with data profiling items in Talend Studio, see the documentation on Talend Help Center (https://help.talend.com).

For more information about importing Jobs with patterns in Talend Studio, see Importing data profiling items or projects.