MATLAB Programming

Regular Expressions
hstr2 = '%%';
expr = '()?..()?';
regexp(hstr2, expr, 'match')
ans =
'%%'
Zero or More — expr*
The first regexp command looks for at least one occurrence of and finds
it. The second command parses a different string for at least one and
fails. The third command uses * toparsethesamelineforzeroormoreline
breaks and this time succeeds.
hstr1 = 'This string has line breaks';
regexp(hstr1, '.*().*', 'match')
ans =
'This string has line breaks';
hstr2 = 'This string has no line breaks';
regexp(hstr2, '.*().*', 'match')
ans =
{}
regexp(hstr2, '.*()*.*', 'match')
ans =
'This string has no line breaks';
OneorMore—expr+
Use + to verify that the HTML image source is not empty. This looks for one
or more characters in the gif filename:
hstr = '';
expr = '