var := SUBSTR string [ skip_count [ length ]]
SUBSTR command extracts a substring from its first argument, string. The start of the substring to extract is denoted by the second parameter skip_count, denoting the number of characters to skip.
The length of the substring to extract is denoted by the third parameter, length. If you supply a negative number for length, its absolute value will be used, and skip_count will start at the end of the string. Isn't STx a splendid beast!
- The string from which to retrieve the substring.
- by denoting the number of characters to skip from the beginning (length≥0) or from the end of the string (length<0), skip_count indicates where to start extracting the substring. The default value is
- Its absolute value determines the length of the substring to extract. If length is less than zero, skip_count characters will be skipped from the end of the string; otherwise, they will be skipped from the beginning of the string. If omitted, the "remaining" part of the string will be extracted.
# skip 1 character, returning 'bcd' #str := substr 'abcd' 1 # skip 2 characters, returning 'cd' #str := substr 'abcd' 2 # skip 1 character, request 2 characters - returning 'bc' #str := substr 'abcd' 1 2 # skip 2 character from the end, request 1 character, returning 'b' #str := substr 'abcd' 2 -1