Question

用matlab 如何提取字符串中的数字？

Answer 1

S = REGEXP(STRING,EXPRESSION)
其中EXPRESSION的取法为：
. Any character
[] Any character contained within the brackets
[^] Any character not contained within the brackets
\w A word character [a-z_A-Z0-9]
\W Not a word character [^a-z_A-Z0-9]
\d A digit [0-9]
\D Not a digit [^0-9]
\s Whitespace [ \t\r\n\f\v]
\S Not whitespace [^ \t\r\n\f\v]
那么你的问题就可以使用下面的代码了
>>a='5000.xls'

a =

5000.xls

>> s=a(regexp(a,'\d'))

s =

5000
这时的s是字符型的，如果你需要数字的话就是用str2num转化一下

祝你学习愉快！

Answer 2

用正则表达式匹配吧：
>>
s
=
'[数字一12000]
[数字二28000]'
s
=
[数字一12000]
[数字二28000]
>>
ms
=
regexp(
s,
'(?<=\w+)\d+',
'match'
)
ms
=
'12000'
'28000'
然后将字符串转换为数字：
>>
num1
=
str2num(
ms{
1
}
)
num1
=
12000