Grep lines that end with numbers

user_9004024 0
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I have a list of lines like: 

Spend: 4,100
Spend2: 2,200
Spend3: 300
Spend4: 1,590
Spend5:

and I'm trying to grep just the lines that end with numbers

I tried

grep "[0-9]+$" filename.txt > filtered.txt
grep "\d$" filename.txt > filtered.txt

but none of these worked

grep linux bash
3 Answers

The + operator is not supported by traditional grep, whose regular expression repertoire is very limited.

All you really care about is whether the last character is a digit, so

grep '[0-9]$' filename.txt

should do what you want. Other approaches include

grep -E '[0-9]+$' filename.txt   # use extended regex repertoire
grep '[0-9]\+$' filename.txt    # POSIX BRE extended
grep -P '\d+$' filename.txt    # PCRE extended; not portable

Notice how I use single quotes throughout. Double quotes introduce additional complications especially with backslashes which you probably want to avoid.

user_8741880

On Basic regular expressions mode you should specify the pattern in the following way:

grep '[0-9]\+$' filename.txt > filtered.txt

In basic regular expressions the meta-characters ‘?’, ‘+’, ‘{’, ‘|’, ‘(’, and ‘)’ lose their special meaning; instead use the backslashed versions ‘\?’, ‘\+’, ‘\{’, ‘\|’, ‘\(’, and ‘\)’.

user_31854590

For extended regular expressions you should use egrep or grep -E.

user_90076740
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