Count trailing occurrences of a character in a string

Counts how many times a specific character appears consecutively at the end of a string, working backwards from the last character. Used internally by the cDNA pipeline for poly(A)/poly(T) tail length estimation from basecalled sequences.

Usage

count_trailing_chars(string, char)

Arguments

string

Character string. The sequence to analyze.

char

Character string of length 1. The character to count at the end of the string.

Value

Integer. Count of trailing character occurrences.

See also

detect_orientation_single where trailing character counts are used for read orientation classification

Examples

if (FALSE) { # \dontrun{

count_trailing_chars("ACGTTTTT", "T")
# Returns 5

count_trailing_chars("ACGT", "A")
# Returns 0

} # }