regexFind

regexFind(str, pattern, [offset])

str is a string or a string vector.

pattern is an ordinary string scalar or a regular expression pattern to be searched in str. Regular expression pattern includes character literals, metacharacters, or a combination of both.

offset (optional) is a non-negative integer with default value of 0. This optional argument is the starting position in str to conduct the search operation. The first character in str corresponds to position 0.

Search in str for another string that matches pattern and return an integer that indicates the beginning position of the first matched substring. If no substring matches, return -1.

regexFind("1231hsdU777_ DW#122ddd", "[a-z]+");
// output
4

regexFind("1231hsdU777_ DW#122ddd", "[0-9]+");
// output
0

regexFind("1231hsdU777_ DW#122ddd", "[0-9]+", 4);
// output
8