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Hi Bakunin,

The OP stated she was using GNU grep at the beginning. However please note that I suggested a general egrep solution. The Posix specification states that egrep is deprecated and that...

Try:
echo "u_sA9e-u" | grep -E '([[:space:]]|^)[a-z_][a-z0-9_-]*[$]?([[:space:]]|$)'

Strange, when I do this I get:
$ echo "u_sA9e-u" | grep -E "([[:space:]]|^)[a-z_][a-z0-9_-]*[$]?([[:space:]]|$)"
$ echo "u_sx9e-u" | grep -E "([[:space:]]|^)[a-z_][a-z0-9_-]*[$]?([[:space:]]|$)"...

@Bakunin, we should also take words at the start (^) or the end of the line ($). Using [<b><tab>]* with no further anchors means that it may match part of a word too, since we are allowing occurrence...