在matlab中,是否将字符串中每个单词的第一个字母大写/大写?

所以使用字符串

str='the rain in spain falls mainly on the plain.'

只需在matlab中使用regexp替换函数,regexprep

regexprep(str,'(\<[a-z])','${upper($1)}')

ans =

The Rain In Spain Falls Mainly On The Plain.

这个 \<[a-z] 匹配每个单词的第一个字符,您可以使用 ${upper($1)}

这也可以用 \<\w 匹配每个单词开头的字符。

regexprep(str,'(\<\w)','${upper($1)}')

因为Matlab附带 build in Perl 对于每个复杂的字符串或文件处理任务,可以使用Perl脚本。所以你可以用这样的方法:

[result, status] = perl('capitalize.pl','the rain in Spain falls mainly on the plane')

其中capitalize.pl是一个Perl脚本,如下所示:

$input  = $ARGV[0];
$input =~ s/([\w']+)/\u\L$1/g;
print $input;

Perl代码取自 this 堆栈溢出问题。

负载方式:

str = 'the rain in Spain falls mainly on the plane'

spaceInd = strfind(str, ' '); % assume a word is preceded by a space
startWordInd = spaceInd+1;  % words start 1 char after a space
startWordInd = [1, startWordInd]; % manually add the first word
capsStr = upper(str);

newStr = str;
newStr(startWordInd) = capsStr(startWordInd)

更优雅/更复杂的——单元格数组、文本扫描和CellFun对于这种事情非常有用:

str = 'the rain in Spain falls mainly on the plane'

function newStr = capitals(str)

    words = textscan(str,'%s','delimiter',' '); % assume a word is preceded by a space
    words = words{1};

    newWords = cellfun(@my_fun_that_capitalizes, words, 'UniformOutput', false);
    newStr = [newWords{:}];

        function wOut = my_fun_that_capitalizes(wIn)
            wOut = [wIn ' ']; % add the space back that we used to split upon
            if numel(wIn)>1
                wOut(1) = upper(wIn(1));
            end
        end
end

    str='the rain in spain falls mainly on the plain.' ;
for i=1:length(str)
    if str(i)>='a' && str(i)<='z'
        if i==1 || str(i-1)==' '
            str(i)=char(str(i)-32); % 32 is the ascii distance between uppercase letters and its lowercase equivalents
        end
    end
end

更少的Elegant和高效,更可读和可维护。