The SUBSTITUTE (abbreviated S) command replaces occurrences of one
string of characters with another string.

Format: SUBSTITUTE/string-1/string-2/ [range] [/BRIEF[:n]] [/QUERY] [/NOTYPE]

Any nonalphanumeric character except % can be used as string delimiters.

All occurrences of string-1 within the specified range are replaced with
string-2.  If you do not specify range, a single occurrence in the
current line is substituted.  The line in which the substitution
occurred is typed after each substitution.

Additional information available:

NEXT

/BRIEF/NOTYPE/QUERY

When you select the /BRIEF (abbreviated /BR) option, only the first n
characters of the line are displayed.  If you omit n, the default is 10.

When you specify /NOTYPE (abbreviated /NOT) the lines in which
substitutions occurred are not typed.

The SUBSTITUTE NEXT (abbreviated N) command replaces the next occurrence
of string-1 with string-2.

Format: [SUBSTITUTE] NEXT [/string-1/string-2/]

The search for string-1 is made forward from the current location. When
a substitution is made, the line where the substitution occurs becomes
the current line.  When the optional strings are omitted, the strings
used in the last SUBSTITUTE or SUBSTITUTE NEXT command are used.

Format: /QUERY

When you use the QUERY (abbreviated /Q) qualifier, EDT prompts you with
a question mark (?) to verify each substitution.

Responses are:

    Y   Yes, do the substitution.
    N   No, do not do the substitution.
    Q   Quit, terminate the command.
    A   All, do the rest of the substitutions without query.