MATLAB: Read data from string

string

I have string line:

 x='abc123(xyz456)'

How to read information only in brackets, to have result:

 y='xyz456'.

Best Answer

>> x='abc123(xyz456)';
>> regexp(x,'(?<=\().+(?=\))','match')
ans = 
    'xyz456'

This command uses regexp and, specifically, lookaround assertions. It's basically saying, if you find a group of characters, look behind to see if there is an "open parenthesis" character and look ahead to see if there is a "close parenthesis" character. If so, return all the characters between them.

Related Solutions

MATLAB: Extracting consecutive digits using regexp

These two returns "123"

%%

cac = regexp('ITEM 123', '.+?(\d+)', 'tokens' )
%%
cac = regexp('ITEM 123', '[^\d]+(\d+)', 'tokens' )

First, '.+' matches anything up til the end of the text, next it gives back just as little as needed to match '(\d+)' , which is one digit.

'.+?' matches as little as needed so that '(\d+)' is able to match the following text.

I prefer '[^\d]+(\d+)'

Or why not just

cac = regexp('ITEM 123', '\d+', 'match' )

MATLAB: How Do I Breakout and Store 2 Time Values In The Same String

In order to capture different parts of an expression, put those parts in parentheses (note in the example below the difference between |\(|, which matches a parentheses, and plain |(|, which begins a group and token.

str = {...
'State Time: 12:00:00.123 (43200.123)'
'State Time: 12:00:01.456 (43200.456)'
'State Time: 12:00:02.789 (43200.789)'};
str = sprintf('%s\n', str{:});
tok = regexp(str, 'State Time:\s+(\d+:\d+:[\d\.]+)\s+\(([\d\.]+)\)', 'tokens');
tok = cat(1, tok{:});

Best Answer

Related Solutions

MATLAB: Extracting consecutive digits using regexp

MATLAB: How Do I Breakout and Store 2 Time Values In The Same String

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