Reply To: X12 – TCL PROC

# I am not big on *ASSUMING* sep characters

set elSep [string index $msg 105]      ;# Normally ~

# get the header (ISA … ~) Just before TRN

set head [string range $msg 0 [string first “${elSep}TRN” $msg]]

# Remove header from message

set msg [string replace $msg 0 [string first “${elSep}TRN” $msg]]

Hope this helps