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How to find prefix in a sting

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cat cat
cat cat 2016-1-11
评论： Stephen23 2016-1-11
Hi! I have a vector of strings and I want to find the prefix
Ex 0234567 --> prefix 0
How can I do?

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Stephen23
Stephen23 2016-1-11
编辑：Stephen23 2016-1-11
Use indexing:
>> str = '0234567';
>> str(1)
ans = 0
  2 个评论
cat cat
cat cat 2016-1-11
If I want to put the results in 2 vector: one prefix, two postfix, how can I do? Thanks
Stephen23
Stephen23 2016-1-11
>> str = '01234567';
>> prf = str(1)
prf = 0
>> pof = str(2:end)
pof = 1234567

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