Add Use An Alternative Delimiter In A Substitution as a sed til

sed/use-an-alternative-delimiter-in-a-substitution.md

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+# Use An Alternative Delimiter In A Substitution
+
+A pretty standard sed substitution command is going to use `/` (the forward
+slash) as the delimiter. The delimiter separates the different parts of the
+command.
+
+```bash
+$ sed 's/critter/creature/' animals.txt
+```
+
+The first delimiter marks the beginning of the regular express to be replaced.
+That expression is everything up to the next delimiter. Then the substute
+expression starts up until the next delimiter.
+
+There is nothing special about the `/` as the delimiter, it just happens to be
+the most commonly used character.
+
+In fact, any visible character can be used as the delimiter with sed.
+
+Some other common ones are `:`, `|`, and `_`. I like how the `pipe` character
+looks.
+
+```bash
+$ sed 's|critter|creature|' animals.txt
+```
+
+But like I said, any visible character will work. If you wanted, you could use
+`Q` though that'll look strange and could cause some confusion when reading
+through your script.
+
+```bash
+$ sed 'sQcritterQcreatureQ' animals.txt
+```