org.apache.beam.sdk.transforms

Class Regex.MatchesName

java.lang.Object

org.apache.beam.sdk.transforms.PTransform<PCollection<java.lang.String>,PCollection<java.lang.String>>

org.apache.beam.sdk.transforms.Regex.MatchesName

All Implemented Interfaces:

java.io.Serializable, HasDisplayData

Enclosing class:

Regex

public static class Regex.MatchesName
extends PTransform<PCollection<java.lang.String>,PCollection<java.lang.String>>

Regex.MatchesName<String> takes a PCollection<String> and returns a PCollection<String> representing the value extracted from the Regex groups of the input PCollection to the number of times that element occurs in the input.

This transform runs a Regex on the entire input line. If the entire line does not match the Regex, the line will not be output. If it does match the entire line, the group in the Regex will be used. The output will be the Regex group.

Example of use:

 PCollection<String> words = ...;
 PCollection<String> values =
     words.apply(Regex.matches("myregex (?<namedgroup>mygroup)", "namedgroup"));
 

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.beam.sdk.transforms.PTransform

name

Constructor Summary

Constructors

Constructor and Description
MatchesName(java.util.regex.Pattern pattern, java.lang.String groupName)

Method Summary

Modifier and Type	Method and Description
PCollection<java.lang.String>	expand(PCollection<java.lang.String> in) Applies this PTransform on the given InputT, and returns its Output.

Methods inherited from class org.apache.beam.sdk.transforms.PTransform

getAdditionalInputs, getDefaultOutputCoder, getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, populateDisplayData, toString, validate

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

MatchesName

public MatchesName(java.util.regex.Pattern pattern,
                   java.lang.String groupName)

Method Detail

expand

public PCollection<java.lang.String> expand(PCollection<java.lang.String> in)

Description copied from class: PTransform

Applies this PTransform on the given InputT, and returns its Output.

Composite transforms, which are defined in terms of other transforms, should return the output of one of the composed transforms. Non-composite transforms, which do not apply any transforms internally, should return a new unbound output and register evaluators (via backend-specific registration methods).

Specified by:

expand in class PTransform<PCollection<java.lang.String>,PCollection<java.lang.String>>