Bash - 从字符串中提取数字
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Bash - Extract numbers from String
提问by user1360250
I got a string which looks like this:
我得到了一个看起来像这样的字符串：
"abcderwer 123123 10,200 asdfasdf iopjjop"
“abcderwer 123123 10,200 asdfasdf iopjjop”
Now I want to extract numbers, following the scheme xx,xxx where x is a number between 0-9. E.g. 10,200. Has to be five digit, and has to contain ",".
现在我想提取数字，遵循方案 xx,xxx 其中 x 是 0-9 之间的数字。例如 10,200。必须是五位数字，并且必须包含“,”。
How can I do that?
我怎样才能做到这一点？
Thank you
谢谢
回答by codaddict
You can use grep:
您可以使用grep：
$ echo "abcderwer 123123 10,200 asdfasdf iopjjop" | egrep -o '[0-9]{2},[0-9]{3}'
10,200
回答by Paused until further notice.
In pure Bash:
在纯 Bash 中：
pattern='([[:digit:]]{2},[[:digit:]]{3})'
[[ $string =~ $pattern ]]
echo "${BASH_REMATCH[1]}"
回答by keyser
Check out pattern matching and regular expressions.
查看模式匹配和正则表达式。
Links:
链接：
and as mentioned above, one way to utilize pattern matching is with grep. Other uses: echo supports patterns (globbing) and find supports regular expressions.
如上所述，使用模式匹配的一种方法是使用 grep。其他用途：echo 支持模式（globbing）并且 find 支持正则表达式。
回答by tripleee
Simple pattern matching (glob patterns) is built into the shell. Assuming you have the strings in $*(that is, they are command-line arguments to your script, or you have used seton a string you have obtained otherwise), try this:
简单的模式匹配（glob 模式）内置在 shell 中。假设你有字符串$*（也就是说，它们是你脚本的命令行参数，或者你已经用set其他方式获得的字符串），试试这个：
for token; do
case $token in
[0-9][0-9],[0-9][0-9][0-9] ) echo "$token" ;;
esac
done
回答by bos
The following example using your input data string should solve the problem using sed.
以下使用输入数据字符串的示例应该可以解决使用 sed 的问题。
$ echo abcderwer 123123 10,200 asdfasdf iopjjop | sed -ne 's/^.*\([0-9,]\{6\}\).*$//p'
10,200
回答by William Pursell
A slightly non-typical solution:
一个稍微不典型的解决方案：
< input tr -cd [0-9,\ ] | tr \ '2' | grep '^..,...$'
(The first tr removes everything except commas, spaces, and digits. The second tr replaces spaces with newlines, putting each "number" on a separate line, and the grep discards everything except those that match your criterion.)
（第一个 tr 删除除逗号、空格和数字以外的所有内容。第二个 tr 用换行符替换空格，将每个“数字”放在单独的行上，grep 丢弃除符合您的标准的所有内容之外的所有内容。）
