Add Match The Beginning And End Of Words as a vim til.

vim/match-the-beginning-and-end-of-words.md

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+# Match The Beginning And End Of Words
+
+Often when doing a substitution for an exact word, say `user` to
+`admin`, I will include spaces on either end of the regex pattern to avoid
+unintentional replacements. For example, I may use something like
+
+```
+:%s/ user / admin /
+```
+
+in order to avoid a substitution like `username` to `adminname`.
+
+In this case, the spaces can be replaced with zero-width regex characters
+that match the beginning and end of a word. These are `\<` and `\>`,
+respectively. Utilizing these, the previous substitution can be achieved
+with
+
+```
+:%s/\<user\>/admin/
+```
+
+See `:h /\<` and `:h /\>` for more details.