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org.sonar.l10n.py.rules.python.S5842.html Maven / Gradle / Ivy

Why is this an issue?
A regex should never include a repetitive pattern whose body would match the empty string. This is usually a sign that a part of the regex is
redundant or does not do what the author intended.
Noncompliant code example
r"(?:)*"      # same as the empty regex, the '*' accomplishes nothing
r"(?:|x)*"    # same as the empty regex, the alternative has no effect
r"(?:x|)*"    # same as 'x*', the empty alternative has no effect
r"(?:x*|y*)*" # same as 'x*', the first alternative would always match, y* is never tried
r"(?:x?)*"    # same as 'x*'
r"(?:x?)+"    # same as 'x*'

Compliant solution
r"x*"