The "Single character alternation" warning shows up in JetBrains' IDEs. The warning reports that the single character alternation (such as
a|b|c) in a regular expression would be better written as a character class instead (i.e.
[abc]). This might even be slightly more performant when it's matching.
For example, consider the following regular expression that allows one of the symbols from;
This could be re-written as:
Please keep in mind that in character classes, the characters
^-]\ need to be escaped.
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