[R] how to parse out string separated by special character

[xin wei]

hi, everyone:
i have a data frame with one single character column as followings:
DS_xxx_yyy_24hr_zzz_1
DS_xxx_yyy_24hr_zzz_2
DS_xxx_yyy_24hr_zzz_3
DS_xxx_yyy_24hr_zzz_4
DS_xxx_yyy_24hr_zzz_1
DS_xxx_yyy_24hr_zzz_2
DS_xxx_yyy_24hr_zzz_3
DS_xxx_yyy_24hr_zzz_4
DS_xxx_yyy_24hr_zzz_1

i need to parse out the time part like the followings:
name                               time
DS_xxx_yyy_24hr_zzz_1      24hr
DS_xxx_yyy_24hr_zzz_2      24hr      
DS_xxx_yyy_24hr_zzz_3      24hr
DS_xxx_yyy_24hr_zzz_4      24hr
DS_xxx_yyy_24hr_zzz_1      24hr
DS_xxx_yyy_24hr_zzz_2      24hr
DS_xxx_yyy_24hr_zzz_3      24hr
DS_xxx_yyy_24hr_zzz_4      24hr
DS_xxx_yyy_24hr_zzz_1      24hr

what function should I look at?
i have tried: strsplit(data, '_') and get a giant list which is not what i
need.

thanks in advance

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