How does thinkphp5 route distinguish between An and A / B?

my code is as follows:
Route::rule ("a _ blank, "index/Index/a");
Route::rule (" a _ Route::rule _ type _ expression, "index/Index/b");
I expect the first route expression to address a, and the second route expression to address b. Actually, they all go to address a.

Nov.06,2021

should be an exact match
Route::rule ('a match, 'index/Index/a');
Route::rule (' an index/Index/b');

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1beb50a-53103.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1beb50a-53103.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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