cwhmisc: cpos – R documentation

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cpos

Find the position of a substring

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 <christian@echoffmann.ch>

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

Miscellaneous Functions for Math, Plotting, Printing, Statistics, Strings, and Tools

v6.6

GPL (>= 2)

Authors

Christian W. Hoffmann

Initial release

2018-08-24, 10:40:10