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https://issues.apache.org/jira/browse/BEAM-7018?focusedWorklogId=280425&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-280425
]
ASF GitHub Bot logged work on BEAM-7018:
----------------------------------------
Author: ASF GitHub Bot
Created on: 22/Jul/19 14:15
Start Date: 22/Jul/19 14:15
Worklog Time Spent: 10m
Work Description: robertwb commented on pull request #8859: [BEAM-7018]
Added Regex transform for PythonSDK
URL: https://github.com/apache/beam/pull/8859#discussion_r305844029
##########
File path: sdks/python/apache_beam/transforms/util.py
##########
@@ -864,3 +867,223 @@ def add_window_info(element,
timestamp=DoFn.TimestampParam,
def expand(self, pcoll):
return pcoll | ParDo(self.add_window_info)
+
+
+class Regex(object):
+ """
+ PTransform to use Regular Expression to process the elements in a
+ PCollection.
+ """
+ @staticmethod
+ def _regex_compile(regex):
+ """Return re.compile if the regex has a string value"""
+ if isinstance(regex, str):
+ regex = re.compile(regex)
+ return regex
+
+ @staticmethod
+ @typehints.with_input_types(str)
+ @typehints.with_output_types(str)
+ @ptransform_fn
+ def matches(pcoll, regex, group=0):
+ """
+ Returns the matches if the element matched the Regex. Returns the
+ entire line (group 0 by default). Group can be integer value or a string
Review comment:
Actually, there's a semantic difference between Python's re.match and Java's
Mather.matches() that we should resolve and call out. Java's matches() requires
the entire string to match, whereas re.match is more like Java's lookingAt. We
should clearly document and test the desired semantics throughout.
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Issue Time Tracking
-------------------
Worklog Id: (was: 280425)
Time Spent: 8.5h (was: 8h 20m)
> Regex transform for Python SDK
> ------------------------------
>
> Key: BEAM-7018
> URL: https://issues.apache.org/jira/browse/BEAM-7018
> Project: Beam
> Issue Type: New Feature
> Components: sdk-py-core
> Reporter: Rose Nguyen
> Assignee: Shehzaad Nakhoda
> Priority: Minor
> Time Spent: 8.5h
> Remaining Estimate: 0h
>
> PTransorms to use Regular Expressions to process elements in a PCollection
> It should offer the same API as its Java counterpart:
> [https://github.com/apache/beam/blob/11a977b8b26eff2274d706541127c19dc93131a2/sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/Regex.java]
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