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Is there a way to set the cursor position for a mapping? For example:

nmap erb; <%= %>

I want to set the cursor after the equals sign. Can this be done?

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I am assuming you want this mapping to insert "<%= =>", so try something like this:

:nmap erb; i<%= =><esc>hh
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inoremap erb; <%= %><left><left><left>
nnoremap erb; a<%= %><left><left><left>

Shall do it.

NB: there exist several plugins that help defining such mappings. For instance, with lh-brackets, the definition would be done with:

Brackets <%= \ %> -trigger=erb;
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