24 lines
781 B
Plaintext
24 lines
781 B
Plaintext
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The regex function `re.sub` can be used to perform a search and replace based on regular expression matches. The `repl` parameter can contain references to capturing groups used in the `pattern` parameter. This can be achieved with `\n` to reference the n'th group.
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When referencing a nonexistent group an error will be thrown for Python < 3.5 or replaced by an empty string for Python >= 3.5.
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== Noncompliant Code Example
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[source,python]
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----
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re.sub(r"(a)(b)(c)", r"\1, \9, \3", "abc") # Noncompliant - result is an re.error: invalid group reference
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----
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== Compliant Solution
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[source,python]
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----
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re.sub(r"(a)(b)(c)", r"\1, \2, \3", "abc")
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----
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== See
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* https://docs.python.org/3.10/library/re.html#re.sub[re.sub] - Python Documentation
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include::../implementation.adoc[]
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