Fix spurious errors when otherwise invalid tokens are used inside str… #1571

Job	Run time
linux-coverage	11m 19s
bindings	18m 8s
build (clang-sanitize, ubuntu-22.04)	33m 26s
conan	6m 10s
build (gcc-release, ubuntu-22.04)	7m 36s
build (gcc-11-release, ubuntu-22.04)	7m 24s
build (gcc-debug-shared, ubuntu-22.04)	6m 46s
build (gcc-debug-noexcept, ubuntu-22.04)	6m 47s
build (macos-release, macos-13)	7m 1s
build (win64-release, windows-latest)	11m 26s
build (win64-debug-shared, windows-latest)	7m 47s
build (win64-debug-noexcept, windows-latest)	7m 36s
	2h 11m 26s

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