grep — find matches of a string in a vector of strings
row=grep(haystack,needle ) [row,which]=grep(haystack,needle ) row=grep(haystack,needle ,[flag]) [row,which]=grep(haystack,needle ,[flag])
A Row vector of character strings.
A character string or a row vector of character strings . The
string(s) to search in haystack.
vector of indices: row where a match has been found or an empty matrix if no match found.
vector of indices: index of needle string found or an empty matrix if no match found.
Character ("r" for regular expression)
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.
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'])