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I am trying to check a string for any Uppercase letter. my code shows NO UPPER for any input, may it be "sss", "Sss", "SSS"
if [[ "$pass" =~ [^a-zA-Z0-9] ]]
then
echo "Upper found"
else
echo "no upper"
fi
651
To find all the uppercase characters in a string, call the replace() method on the string passing it a regular expression, e.g. str. replace(/[^A-Z]/g, '') . The replace method will return a new string containing only the uppercase characters of the original string.
$() – the command substitution. ${} – the parameter substitution/variable expansion.
Example of command substitution using $() in Linux: Again, $() is a command substitution which means that it “reassigns the output of a command or even multiple commands; it literally plugs the command output into another context” (Source).
[^a-zA-Z0-9] means anything except for a-z, i.e. lowercase letters, A-Z, i.e. uppercase letters, and 0-9, i.e. digits. sss, Sss, SSS all contain just letters, so they can't match.
[[ $password =~ [A-Z] ]]
is true if the password contains any uppercase letter.
You should set LC_ALLbefore running this kind of tests, as for example
$ LC_ALL=cs_CZ.UTF-8 bash -c '[[ č =~ [A-Z] ]] && echo match'
match
$ LC_ALL=C bash -c '[[ č =~ [A-Z] ]] && echo match'
# exit-code: 1
[[:upper:]] should work always.
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