cpos: Find the position of a substring

In cwhmisc: Miscellaneous Functions for Math, Plotting, Printing, Statistics, Strings, and Tools

Description

cpos, cposV finds the first position of a substring;
cposR returns a list with starting and ending positions, works only with a single string;
issubstr checks if is a substring

Usage

cpos(str,sub,start=1)
cposV(vstr,sub,vstart=1)
cposR(str, sub, restrict)
issubstr(str,sub,start=1)

Arguments

str	string to examine
vstr	vector of strings to examine
sub	(vector of) substring to find
start,vstart	(vector of) integer, position(s) of start of search
restrict	vector of lower and upper index the search should be restricted to. If missing, whole 'str' is taken.

Value

cpos,cposL,cposV number, if found, NA otherwise.
cposR list(first,last) for each occurrence of sub within the restriction restrict of str; If there is none, then first=NA,last=NA.

Note

parameters in cposV will be recycled, so that all have the same (maximum) length.

Author(s)

Christian W. Hoffmann <[e-mail]>

Examples

  cpos(" Baldrian","a",5) #  3
  cpos("Baldrian","B",15) # NA
  cposR(" Baldabcrian  abcf","abc")
#$first  6 15
#$last   8 17
  cposR(" Baldabcrian  abcf","abc",c(2:16))
#$first 6
#$last  8
  cposV(c("Xcdbeesh","withh "),c("X","h","ees"),c(1,5))
# 1 4 5
issubstr("Today is a wonderful day","wonder")

cwhmisc documentation built on May 1, 2019, 7:55 p.m.