I want to exclude any files ending with '.ses' or files with no extension using the following regex pattern. It works fine in command line but not in a shell (bash/ksh).
Regex pattern: "\.(?!ses\$)([^.]+\$)"
File name examples:
"/test/path/test file with spaces.__1" (expected true)
"/test/path/test file with spaces.ses" (expected false)
"/test/path/test file with spaces" (expected false)
"/test/path/test file with spaces.txt" (expected true)
FILE_NAME="/test/path/test file with spaces.__1"
PATTERN_STR="\.(?!ses\$)([^.]+\$)"
if [[ "${FILE_NAME}" =~ ${PATTERN_STR} ]]; then
Match_Result="true"
else
Match_Result="false"
fi
echo $Match_Result
it returns "true" but "false" in the shell. Anyone knows why?
I would just use a case statement with suitable globs:
case "${FILE_NAME##*/}" in
*.ses)
Match_Result=false
;;
*.*)
Match_Result=true
;;
*)
Match_Result=false
;;
esac
Consider using an array instead of doing whitespace gymnastics.
You can reverse your logic and fail all strings that contain .ses at the end or do not contain a dot after the last /.
Then, you can use this script:
#!/bin/bash
declare -a arr=("/test/path/test file with spaces.__1"
"/test/path/test file with spaces.ses"
"/test/path/test file with spaces"
"/test/path/test file with spaces.txt")
# true false false true
PATTERN_STR='(/[^/.]+|\.ses)$'
for FILE_NAME in "${arr[@]}"; do
if [[ "$FILE_NAME" =~ $PATTERN_STR ]]; then
Match_Result="false"
else
Match_Result="true"
fi
echo $Match_Result
done;
Output:
true
false
false
true
Details:
( - start of a capturing group:
/[^/.]+ - / and then one or more chars other than / and .| - or
\.ses - .ses) - end of grouping$ - end of a string.A case insensitive version is enabled with shopt -s nocasematch/shopt -u nocasematch (see Case insensitive regex in Bash).