fix dataset text filter bug

haoneng.lhn

2023-07-12 bcf3b486475fbb0a98d62280d47b9c1951368b8c

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p m    p.m.
pm    p.m.
p.m.
p.m    p.m.
am    a.m.
a.m.
a.m    a.m.
a m    a.m.