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How can I get sed to only match to the first occurrence of a character?

user2871860 Published at Dev
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user2871860

I'm using GNU Sed 4.2.1. I'm trying to replace the second field in the following line (the password in /etc/shadow). Awk is not an option.

username:P@s$w0rDh@$H:15986:0:365::::

I've tried

sed -i 's/\(^[a-z]*\):.*?:/\1:TEST:/'

but nothing. I've tried many variations but for some reason I can't get it to only match that field. Help?

nosid

Use [^:]* to match everything up until the next :

sed -i 's/^\([^:]*\):\([^:]*\):/\1:TEST:/'

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