在 Matlab R2015 中计算字符串中数字和字符的函数

function for counting digits and char in string in Matlab R2015

我在单元格中有一个字符串,例如 '5a5ac66'。我想计算该字符串中的数字和字符数。

'5a5ac66'= 4 位数字 (5566) 和 3 个字符 (aac)

我该怎么做? MATLAB中有函数吗?

一个简单的(不一定是最优的)解决方案如下:

digits = sum(x >= '0' & x <= '9');
chars = sum((x >= 'A' & x <= 'Z') | (x >= 'a' & x <= 'z'));

您可以使用正则表达式来完成。例如:

s = '5a5ac66';
digit_indices = regexp(s, '\d');  %find all starting indices for a digit
num_digits = length(digit_indices); %number of digits is number of indices

num_chars = length(regexp(s, '[a-zA-Z]'));  

是的,有一个内置函数,isstrprop. It tells you which characters are within the given range, in your case 'digit' or 'alpha'. You can then use nnz 获取此类字符的数量:

str = {'5a5ac66'};
n_digits = nnz(isstrprop(str{1},'digit')); %// digits
n_alpha = nnz(isstrprop(str{1},'alpha')); %// alphabetic

如果您有一个包含多个字符串的元胞数组:

str = {'5a5ac66', '33er5'};
n_digits = cellfun(@nnz, isstrprop(str,'digit')); %// digits
n_alpha = cellfun(@nnz, isstrprop(str,'alpha')); %// alphabetic