identifier-3 or literal-1

Is the subject field (the item whose occurrences are replaced).

Identifier-3 can be:

• An elementary alphanumeric data item
• A numeric data item with USAGE DISPLAY
• X An external floating point item

Literal-1 must be nonnumeric, and can be any figurative constant that does not begin with the word ALL. If literal-1 is a figurative constant, it is considered to be a 1-character nonnumeric literal.

identifier-5 or literal-3

Is the substitution field (the item that replaces the subject field).

Identifier-5 can be:

• An elementary alphanumeric data item
• A numeric data item with USAGE DISPLAY
• X An external floating point item

Literal-3 must be nonnumeric, and can be any figurative constant that does not begin with the word ALL.

If literal-3 is a figurative constant, it is considered to be the same length as the subject field.

The subject field and the substitution field must be the same length.

CHARACTERS BY

When the CHARACTERS BY phrase is used, the substitution field must be 1 character in length.

When CHARACTERS BY is specified and neither the BEFORE nor AFTER phrase is specified, the substitution field replaces each character in the inspected item (identifier-1), beginning at the leftmost character and continuing to the rightmost.

ALL

When ALL is specified and neither the BEFORE nor AFTER phrase is specified, the substitution field replaces each non-overlapping occurrence of the subject field in the inspected item (identifier-1), beginning at the leftmost character position and continuing to the rightmost.

LEADING

When LEADING is specified and neither the BEFORE nor AFTER phrase is specified, the substitution field replaces each contiguous non-overlapping occurrence of the subject field in the inspected item (identifier-1), provided that the leftmost such occurrence is at the point where comparison began in the first comparison cycle for which this substitution field is eligible to participate.

FIRST

When FIRST is specified and neither the BEFORE nor AFTER phrase is specified, the substitution field replaces the leftmost occurrence of the subject field in the inspected item (identifier-1).

Subtopics:

• 6.2.21.3.1 Replacement Rules

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