bash regex 匹配语义版本号
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bash regex to match semantic version number
提问by lukemh
I have the following:
我有以下几点：
versionNumber=$(sw_vers -productVersion) # Finds version number
versionShort=${versionNumber:0:4} # Cut string to 1 decimal place for calculation
which works when versions are like this:
当版本是这样的时它的工作原理：
10.9.2
10.9.5
but it will not match
但它不会匹配
10.10.3
as it will return only
因为它只会返回
10.1
but I want the versionShort to be set to
但我希望将 versionShort 设置为
10.10
I am wanting to match the major version, the first dot and the minor version as above.
我想匹配上面的主要版本，第一个点和次要版本。
回答by Amadan
Regexpless solution - cut off last dot and whatever follows it:
Regexpless 解决方案 - 切断最后一个点和它后面的任何内容：
versionShort=${versionNumber%.*}
回答by n8felton
I had a similar question, but I needed access to all 3 segments. I did a bit of research and testing and I found this to work well
我有一个类似的问题，但我需要访问所有 3 个部分。我做了一些研究和测试，我发现这很好用
product_version=$(sw_vers -productVersion)
semver=( ${product_version//./ } )
major="${semver[0]}"
minor="${semver[1]}"
patch="${semver[2]}"
echo "${major}.${minor}.${patch}"
To answer this question directly, you could
要直接回答这个问题，您可以
product_version=$(sw_vers -productVersion)
semver=( ${product_version//./ } )
major="${semver[0]}"
minor="${semver[1]}"
patch="${semver[2]}"
versionShort="${major}.${minor}"
or you can use less variables
或者你可以使用更少的变量
product_version=$(sw_vers -productVersion)
semver=( ${product_version//./ } )
versionShort="${semver[0]}.${semver[1]}"
回答by Aleks-Daniel Jakimenko-A.
Regexp solution:
正则表达式解决方案：
[[ $versionNumber =~ ^[0-9]+\.[0-9]+ ]] && echo "${BASH_REMATCH[0]}"
It will always print first two numbers, for example all these:
它将始终打印前两个数字，例如所有这些：
10.5
10.5.9
10.5.8.2
Will result in 10.5output. You can also add an elseclause to check if something wrong happened (no match found).
将导致10.5输出。您还可以添加一个else子句来检查是否发生了错误（未找到匹配项）。
Here is a longer version:
这是一个更长的版本：
if [[ $versionNumber =~ ^[0-9]+\.[0-9]+ ]]; then
versionShort=${BASH_REMATCH[0]}
else
echo "Something is wrong with your version" >&2
fi
回答by rhinoceros.xn
https://github.com/fsaintjacques/semver-toolhttps://github.com/fsaintjacques/semver-tool/blob/master/src/semver
https://github.com/fsaintjacques/semver-tool https://github.com/fsaintjacques/semver-tool/blob/master/src/semver
SEMVER_REGEX="^(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)(\-[0-9A-Za-z-]+(\.[0-9A-Za-z-]+)*)?(\+[0-9A-Za-z-]+(\.[0-9A-Za-z-]+)*)?$"
function validate-version {
local version=
if [[ "$version" =~ $SEMVER_REGEX ]]; then
# if a second argument is passed, store the result in var named by
if [ "$#" -eq "2" ]; then
local major=${BASH_REMATCH[1]}
local minor=${BASH_REMATCH[2]}
local patch=${BASH_REMATCH[3]}
local prere=${BASH_REMATCH[4]}
local build=${BASH_REMATCH[5]}
eval "=(\"$major\" \"$minor\" \"$patch\" \"$prere\" \"$build\")"
else
echo "$version"
fi
else
error "version $version does not match the semver scheme 'X.Y.Z(-PRERELEASE)(+BUILD)'. See help for more information."
fi
}