Cross platform regex substring match for git-CodePudding

Sorry for yet another pattern matching question, but I'm struggling to to find a tool that will do a regex in a git hook. It needs to work on Windows, Mac and Linux.

This gnu grep works for Windows and Linux, but not Mac (because bsd)

echo "feature/EOPP-234-foo" | grep -Po -e '[A-Z]{4}-\d{1,5}'

This works for Mac and Linux, but not windows (because <git>\usr\bin\egrep don't seem to work)

echo "feature/EOPP-234-foo" | egrep -o '[A-Z]{4}-\d{1,5}'

sed might be the most common tool, but stuffed if I can get it to match:

echo "feature/EOPP-234-foo" | sed -n 's/^.*\([A-Z]{4}\-\d{1,5}\).*$/\1/p'

I've even tried bash matching with no luck

[[ "feature/EOPP-234-foo" =~ ([A-Z]{4}-\d{1,5}) ]] && echo ${BASH_REMATCH[1]}

Any ideas?

CodePudding user response：

When you need to make POSIX tools run on Windows, you need to remember to use double quotation marks around your commands, not single quotes.

Also, you can use a common POSIX ERE compliant regex across all these environments. This means \d must be replaced with [0-9] or [[:digit:]] as \d is a PCRE only compliant construct.

You can use

grep -Eo "[A-Z]{4}-[0-9]{1,5}"
grep -Eo "[A-Z]{4}-[[:digit:]]{1,5}"

CodePudding user response：

I suggest:

echo "feature/EOPP-234-foo" | grep -o -e "[A-Z]\{4\}-[0-9]\{1,5\}"

[[ "feature/EOPP-234-foo" =~ ([A-Z]{4}-[0-9]{1,5}) ]] && echo "${BASH_REMATCH[1]}"