Check

Check[expr, failexpr]
evaluates expr, and returns the result, unless messages were generated, in which case it evaluates and returns failexpr.

Check[expr, failexpr, {s₁::t₁, s₂::t₂, ...}]
checks only for the specified messages.

Check[expr, failexpr, "name"]
checks only for messages in the named message group.

Check does not test for messages that have been switched off using Off, or by uses of Quiet that occur inside it.

In Check[expr, failexrp, "name"], possible named message groups are given by $MessageGroups.

Return err when a message is generated:

Check only for specific messages:

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