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Please note that the recommended version of Scilab is 2025.0.0. This page might be outdated.
See the recommended documentation of this function
strindex
search position of a character string in an other string.
Calling Sequence
ind=strindex(haystack,needle,[flag]) [ind,which]=strindex(haystack,needle,[flag])
Arguments
- haystack
A character string. The string where to search occurrences of
needle
- needle
A character string or character string vector . The string(s) to search in
haystack
- ind
vector of indexes
- which
vector of indexes
- flag
string("r" for regular expression)
Description
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
Examples
k=strindex('SCI/demos/scicos','/') k=strindex('SCI/demos/scicos','SCI/') k=strindex('SCI/demos/scicos','!') k=strindex('aaaaa','aa') k=strindex('SCI/demos/scicos',['SCI','sci']) [k,w]=strindex('1+3*abc/2.33',['+','-','*','/']) k=strindex('2' ,'/2(]*)?$\1/' ,'r')
See Also
<< strcspn | Strings | string >> |