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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 This page might be outdated.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
grep
find matches of a string in a vector of strings
Calling Sequence
row=grep(haystack,needle ) [row,which]=grep(haystack,needle ) row=grep(haystack,needle ,[flag]) [row,which]=grep(haystack,needle ,[flag])
Arguments
- haystack
A Row vector of character strings.
- needle
A character string or a row vector of character strings . The string(s) to search in
haystack.
- row
vector of indices: row where a match has been found or an empty matrix if no match found.
- which
vector of indices: index of needle string found or an empty matrix if no match found.
- flag
Character ("r" for regular expression)
Description
Foreach entry of haystack
, grep searches if at
least a string in needle
which matches a substring.
The haystack
entries index where at least a match has
been found are returned in the row
output argument.
The optionnal which
output argument gives the index
of first string of needle
found.
When using the third parameter flag="r"
, the
needle
is expected to be a regular expression string.
In this case, grep
uses the
needle
as a regular expression and compares it
against haystack
according to the regular express
rules. See the regexp function for details about
regular expressions.
Example #1
In the following example, we search one or two strings in a text,
which is stored in the txt
variable.
txt=['find matches of a string in a vector of strings' 'search position of a character string in an other string' 'Compare Strings']; grep(txt,'strings') grep(txt,['strings' 'Strings']) [r,w]=grep(txt,['strings' 'Strings'])
Example #2
In the following example, we perform regexp searches.
str = ["hat";"cat";"hhat";"chat";"hcat";"ccchat";"at";"dog"] grep(str,'/[hc]+at/','r') grep(str,'/[hc]?at/','r') grep(str,'/cat|dog/','r')
See Also
<< evstr | Strings | isalphanum >> |