Limited regular expressions #2504
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This looks good to me. My top concern is complexity - but this keeps it simple. |
src/tests/Microsoft.PowerFx.Core.Tests.Shared/ExpressionTestCases/Match_Limited.txt
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src/tests/Microsoft.PowerFx.Core.Tests.Shared/ExpressionTestCases/Match_Limited.txt
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Do all positive tests under Match_Limited.txt work in Power Apps? |
| @@ -153,12 +153,12 @@ private static bool ShouldSkipDotNetVersion(ExpressionTestCase testCase, string | |||
| return false; | |||
| } | |||
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| #if false | |||
| #if true | |||
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Before we GA regular expressions in C# we'd like to have one consistent regular expression language between C# and Canvas. This PR limits regular expressions to common features that are supported, with consistent semantics, by both canonical .NET (used by the C# interpreter) and XRegExp (used by Canvas/JavaScript). It is better to disallow now and bring back with customer demand or as platforms add more support.
.NET Features that are disallowed:
(a\1).(?'name'...and\k'name'.\o(letter o) could be added in the future, but we should avoid\0(zero) which causes backreference confusion.[a-z-[m-n]].