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Results tagged with pattern-matching
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user 52386
Questions on expression testing and manipulation through pattern matching and constructing efficient patterns.
2
votes
Unexpected behavior using `ReplaceAll[]` for nested lists
The issue is that the provided pattern also matches the outer list.
Therefore ReplaceAll[] replaces the outer list and stops (as there are no elements left).
To overcome this issue, Map[] must be use …
- 287
10
votes
2
answers
267
views
Unexpected behavior using `ReplaceAll[]` for nested lists [duplicate]
ReplaceAll[] might lead to unexpected behavior (at least it surprised me).
I use ReplaceAll[] to convert a list (basically data cleanup).
For the command:
{{1, "2"}, {2, "3"}} /. {x_, _ } :> {x, "SO …
- 287
5
votes
1
answer
482
views
Use cases to select subelements by Regex
I have a nested list and would like to select a sub set of lists using a RegEx and I would prefer to use patterns (mainly for readability).
list = {
{"1", "abc"},
{"2", "abd"},
{"3", "c"}
}
W …
- 287