Mathematica Asked on May 5, 2021
Given
records = {<|"Material" -> "FG126", "Batch" -> "0000000009", "CreationDateTime" -> "/Date(1474502400000+0000)/"|>,
<|"Material" -> "FG126","Batch" -> "0000000011", "CreationDateTime" -> "/Date(1474588800000+0000)/"|>};
records /. (a_String /;
StringMatchQ[a, "/Date(" ~~ ___ ~~ "+0000)/"] :> StringTake[a, {7, 19}])
Returns
{<|"Material" -> "FG126", "Batch" -> "0000000009",
"CreationDateTime" ->
StringTake[
"/Date(1474502400000+0000)/", {7, 19}]|>, <|"Material" -> "FG126",
"Batch" -> "0000000011",
"CreationDateTime" ->
Instead of
{<|"Material" -> "FG126", "Batch" -> "0000000009", "CreationDateTime" ->"1474502400000"|>,
<|"Material" -> "FG126", "Batch" -> "0000000011", "CreationDateTime" -> "1474588800000"|>}
The final desired outcome is actually to get the value at CreationDateTime processed as
FromUnixTime[creationDateTime/1000]
You can wrap rhs in lhs :> rhs with RuleCondition to force evaluation of the expression rhs:
records /. (a_String /;
StringMatchQ[a, "/Date(" ~~ ___ ~~ "+0000)/"] :>
RuleCondition[StringTake[a, {7, 19}]])
{<|"Material" -> "FG126", "Batch" -> "0000000009", "CreationDateTime" -> "1474502400000"|>, <|"Material" -> "FG126", "Batch" -> "0000000011", "CreationDateTime" -> "1474588800000"|>}
Or use RuleCondition instead of Condition (/;):
records /. a_String :>
RuleCondition[StringTake[a, {7, 19}], StringMatchQ[a, "/Date(" ~~ ___ ~~ "+0000)/"] ]
{<|"Material" -> "FG126", "Batch" -> "0000000009", "CreationDateTime" -> "1474502400000"|>, <|"Material" -> "FG126", "Batch" -> "0000000011", "CreationDateTime" -> "1474588800000"|>}
See also: The answers Replacement inside held expression.
Correct answer by kglr on May 5, 2021
It works if you take the data out of the association for the replacement.
Map[Association, Normal[records] /. (a_String /; StringMatchQ[a,
"/Date(" ~~ ___ ~~ "+0000)/"] :> StringTake[a, {7, 19}])]
{<|"Material" -> "FG126", "Batch" -> "0000000009", "CreationDateTime" -> "1474502400000"|>, <|"Material" -> "FG126", "Batch" -> "0000000011", "CreationDateTime" -> "1474588800000"|>}
Answered by Chris Degnen on May 5, 2021
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