instr: Position of the nth occurrence of a string in another one

In survPen: Multidimensional Penalized Splines for Survival and Net Survival Models

Position of the nth occurrence of a string in another one

Description

Returns the position of the nth occurrence of str2 in str1. Returns 0 if str2 is not found. This code was first suggested by Abdelmonem Mahmoud Amer in https://stackoverflow.com/a/33005653/5421090

Usage

instr(str1, str2, startpos = 1, n = 1)

Arguments

str1	main string in which str2 is to be found
str2	substring contained in str1
startpos	starting position in str1; default is 1
n	which occurrence is to be found; default is 1

Value

number representing the nth position of str2 in str1

Examples

library(survPen)

instr("character test to find the position of the third letter r","r",n=3)

survPen documentation built on Sept. 14, 2023, 1:06 a.m.