Grep wilcard of unknown length In between pipes

Question

I'm trying to grep the following string:

Line must start with a 15 and the rest of the string can have any length of numbers between the pipes. There must be nothing in between the last 2 pipes.

"15|155702|0101|1||"

So far i have:

grep "^15|" $CONCAT_FILE_NAME >> "VAS-"$CONCAT_FILE_NAME

I'm having trouble specifying any length of numbers when using [0-9]

Answer 1

You need to escape the |

grep -E '^15\|([[:digit:]]+\|)+\|$'