[5.1] Fix AppNameCommand when setting composer namespace #13208
Merged
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Fix AppNameCommand when setting composer namespace for namespaces with more than one section.
If the namespace is changed using the artisan app:name command to Hello\World it changes fine since the original namespace has only a single section. Then if the namespace is changed again it was failing because it couldn't match the original namespace on the replacement sentence.
Escaping the slashes solves the problem.