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C intercept string

2022-07-06 07:27:00 【weixin_ forty million nine hundred and thirty-eight thousand th】

Reference resources c# The index and length must refer to the position within the string . Parameter name : length
If you need the twelfth string The following numbers only need substring（12）, If write substring（12,str.length） Insufficient length will be prompted 

string pan1 = str.Substring(9, 12);
string y = str.Substring(12);
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