Capitalizing every word in a string

str='The bottom of the deep blue sea'

strN='The Bottom Of The Deep Blue Sea'

To convert the string 'str' to 'strN' is used:

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

Can someone please xeplain this? Another suggestion which did not work was:

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

Is there a simpler (it is ok if it is longer) way of doing this?

[Stephen23]

regexprep(str,'(\w)(\w+)','${upper($1)}$2')

Answer 1

[Jan]

I like simple Matlab code:

m      = [false, isspace(str)];
m      = m(1:length(str));
str(m) = upper(str(m))

By the way, tested with: '', ' ', 'a', 'aA', ' a', ' a ', ' ab c', ' ab c ' .

Some timings:

str0='The bottom of the deep blue sea';

tic
for k = 1:1e4
  str    = str0;
  m      = [false, isspace(str)];
  m      = m(1:length(str));
  str(m) = upper(str(m));
end
toc

tic
for k = 1:1e4
  str = str0;
  str = regexprep(str,'(\<[a-z])','${upper($1)}');
end
toc

0.17 seconds  % Simple Matlab
3.24 seconds  % Powerful REGEXP