strindex — search position of a character string in an other string.
ind=strindex(haystack,needle,[flag]) [ind,which]=strindex(haystack,needle,[flag])
A character string. The string where to search occurrences of
needle
A character string or character string vector . The string(s)
to search in haystack
vector of indexes
vector of indexes
string("r" for regular expression)
strindex searches indexes where needle
(i) is found in haystack
for each k it exist a i shuch
that part(haystack,ind(k)+(0:length(needle(i))-1)) is
the same string than needle(i). If
which argument is required it contains these
i. When using the third parameters "r", the needle
should be a string of regular expression. And then strindex is going to
match it with haystack according to the regular express rules.
strindex without regular expression argument is
based on Knuth-Morris-Pratt algoritm.
This algorithm is more powerful than that used in scilab 4.x. In some special case, result can be different.
example:
// scilab 5.x
-->[k,w]=strindex('aab',['a','ab'])
w = 1. 1. 2. k = 1. 2. 2.
// scilab 4.x
-->[k,w]=strindex('aab',['a','ab'])
w = 1. 1. k = 1. 2.
The rules of regular expression are similar to perl language. For a quick start , see http://perldoc.perl.org/perlrequick.html. For a more in-depth tutorial on , see http://perldoc.perl.org/perlretut.html and for the reference page, see http://perldoc.perl.org/perlre.html