How can I find numbers within specified range of characters in a string in bash?
Question
If I have a string "213_str_12" . I want to find digits only within first 5 characters so I would get only 212 . Is that possible in bash?
1 answers
solution1
0 ACCPTED 2020-07-01 04:26:41
Using only bash you can do
s='213_str_12'
f5="${s:0:5}"
echo "${f5//[^0-9]/}"
213
f5 contains the first 5 chars and then replaces all the non-digits to an empty string.
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