unexpected output using regex on sed in unix -

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echo "abc123" | sed s/[a-z]*/text/g

for above command output 

text1text2text3text

should not texttexttext123?

it because using quantifier * matches 0 or more of [a-z]. first matches abc , due use of g (global) mode matches empty text after 1, 2, 3 well.

however if tweak regex removing * using;

echo "abc123" | sed 's/[a-z]/text/g'

then wil get:

texttexttext123

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