Awk split string into words and numbers

Question

I am trying to split of letter and number boundaries, but the solution with lookarounds fails:

echo 50cats30dogs100squirrels | awk '{split($0,a,/(?<=\D)(.*)(?=\d)/); print a[1],a[2],a[3]}'

awk: illegal primary in regular expression (?<=\D)(.*)(?=\d) at <=\D)(.*)(?=\d)
 source line number 1
 context is
     >>> {split($0,a,/(?<=\D)(.*)(?=\d)/) <<<

Is there a way to do this in Awk in other way?

Edit:

Sorry for not being clear. The expected output is to just add spaces like this:

50 cats 30 dogs 100 squirrels

Answer 1

仅使用您展示的样品。如果这是您正在寻找的内容，请尝试以下操作。在 GNU 中编写和测试awk（应该适用于任何awk我相信的）。

echo "50cats30dogs100squirrels" | awk '{gsub(/[^0-9]+/," & ")} 1'

显示示例的输出如下：

50 cats 30 dogs 100 squirrels

Answer 2

有没有办法以其他方式在 awk 中做到这一点？

我将AWK按照以下方式使用 GNU完成此任务，让file.txt内容成为

50cats30dogs100squirrels

然后

awk 'BEGIN{FPAT="([[:alpha:]]+)|([[:digit:]]+)"}{$1=$1;print}' file.txt

输出

50 cats 30 dogs 100 squirrels

说明：我指示 AWK 使用FPAT. 然后我做$1=$1导致字符串重建（没有$1=$1;输出将与输入相同）和print它。

（在 gawk 4.2.1 中测试）