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39 lines
876 B
Plaintext
39 lines
876 B
Plaintext
NAME
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substr - extract a substring of given string
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SYNOPSIS
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substr(str, pos, len)
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TYPES
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str string
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pos nonnegative integer
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len nonnegative integer
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return string
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DESCRIPTION
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If pos > length of str or len is zero, the null string "" is returned.
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If 1 <= pos <= strlen(str), substr(str, pos, len) returns the
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string of length min(strlen(str) - pos + 1, len) formed by
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consecutive characters of str starting at position pos, i.e. the
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string has length len if this is possible, otherwise it ends with
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the last character of str. (The first character has pos = 1, the
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second pos = 2, etc.)
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If pos = 0, the result is the same as for pos = 1.
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EXAMPLE
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> A = "abcde";
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> print substr(A,0,2), substr(A,1,2), substr(A,4,1), substr(A,3,5)
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ab ab d cde
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LIMITS
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none
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LIBRARY
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none
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SEE ALSO
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XXX - fill in
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