mysql - how do I trim an email input address so only the data before the @ is inputted into the database? -

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i using coldfusion 9 add data mysql database form.

i create username email address inputed form.

for example, 

<cfset store_user_email = emailaddress> <cfset store_username = trim emailaddress before @>

i'm not sure how trim down email address?

any appreciated.

<cfset store_username = trim(listfirst(emailaddress,"@"))>

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