org.apache.beam.sdk.transforms

Class Regex.ReplaceFirst

java.lang.Object

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

org.apache.beam.sdk.transforms.Regex.ReplaceFirst

All Implemented Interfaces:

java.io.Serializable, HasDisplayData

Enclosing class:

Regex

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

Regex.ReplaceFirst<String> takes a PCollection<String> and returns a PCollection<String> with the first Strings that matched the Regex being replaced with the replacement string.

This transform runs a Regex on the entire input line. If a portion of the line does not match the Regex, the line will be output without changes. If it does match a portion of the line, the first portion matching the Regex will be replaced with the replacement String.

Example of use:

 PCollection<String> words = ...;
 PCollection<String> values =
     words.apply(Regex.replaceFirst("myregex", "myreplacement"));
 

See Also:

Serialized Form

Field Summary

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

name

Constructor Summary

Constructors

Constructor and Description
ReplaceFirst(java.util.regex.Pattern pattern, java.lang.String replacement)

Method Summary

Modifier and Type	Method and Description
PCollection<java.lang.String>	expand(PCollection<java.lang.String> in) Override this method to specify how this PTransform should be expanded on the given InputT.

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

ReplaceFirst

public ReplaceFirst(java.util.regex.Pattern pattern,
                    java.lang.String replacement)

Method Detail

expand

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

Description copied from class: PTransform

Override this method to specify how this PTransform should be expanded on the given InputT.

NOTE: This method should not be called directly. Instead apply the PTransform should be applied to the InputT using the apply method.

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>>