Teledyne LeCroy SAS_SATA Protocol Suite Verification Script Engine Reference Manual - Manual (Page 81)

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21.3 Get and Set Characters in Strings
You can set and get characters at positions in CSL-script-file string objects.
Format :
str [ index ]
Parameter
index
Position in string
Example
str = "Brush your teeth before going to bed";
# Get character at some index.
c = str[ 6 ]; # c = "y"
# Set characters or substring at some index.
str[ 11 ] = "hands"; # str = "Brush your hands before going to bed";
str[ 33 ] = "sleep"; # str = "Brush your hands before going to sleep";