Package org.apache.beam.sdk.transforms
Class Regex.ReplaceFirst
- java.lang.Object
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- org.apache.beam.sdk.transforms.PTransform<PCollection<java.lang.String>,PCollection<java.lang.String>>
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- org.apache.beam.sdk.transforms.Regex.ReplaceFirst
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- 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 aPCollection<String>
and returns aPCollection<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
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Field Summary
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Fields inherited from class org.apache.beam.sdk.transforms.PTransform
name, resourceHints
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Constructor Summary
Constructors Constructor Description ReplaceFirst(java.util.regex.Pattern pattern, java.lang.String replacement)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description PCollection<java.lang.String>
expand(PCollection<java.lang.String> in)
Override this method to specify how thisPTransform
should be expanded on the givenInputT
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Methods inherited from class org.apache.beam.sdk.transforms.PTransform
compose, compose, getAdditionalInputs, getDefaultOutputCoder, getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, getResourceHints, populateDisplayData, setResourceHints, toString, validate, validate
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Method Detail
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expand
public PCollection<java.lang.String> expand(PCollection<java.lang.String> in)
Description copied from class:PTransform
Override this method to specify how thisPTransform
should be expanded on the givenInputT
.NOTE: This method should not be called directly. Instead apply the
PTransform
should be applied to theInputT
using theapply
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 classPTransform<PCollection<java.lang.String>,PCollection<java.lang.String>>
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