...

The router ospf line matches the source, but hostname R[A-Z]+ regex does not match hostname R1. Because all input lines must match the source, the condition fails.

Sequential mode:

Sequential mode requires all input lines to be present in the source in the same order as entered. Additional lines may appear between them.

...

Both lines are present in the source, but they appear in the opposite order. Sequential mode therefore fails.

Strict mode:

Strict mode requires input lines to be present in the same order as entered and consecutively in the source. No additional lines may appear between the matching lines.

...