Regex 什么是'\K'；这个正则表达式是什么意思？
给出下面的shell脚本，有人能解释一下Regex 什么是'\K'；这个正则表达式是什么意思？,regex,bash,grep,Regex,Bash,Grep,给出下面的shell脚本，有人能解释一下grep-Poregex吗 #!/bin/bash # Issue the request for a bearer token, json is returned raw_json=`curl -s -X POST -d "username=name&password=secret&client_id=security-admin-console" http://localhost:8081/auth/realms/master/toke
grep-Po#!/bin/bash
# Issue the request for a bearer token, json is returned
raw_json=`curl -s -X POST -d "username=name&password=secret&client_id=security-admin-console" http://localhost:8081/auth/realms/master/tokens/grants/access`
# Strip away all but the "access_token" field's value using a Python regular expression
bearerToken=`echo $raw_json | grep -Po '"'"access_token"'"\s*:\s*"\K([^"]*)'`
echo "The bearer token is:"
echo $bearerToken
grep -Po '"'"access_token"'"\s*:\s*"\K([^"]*)'`
如果有人发现了这篇文章，我最终使用了以下内容：
if hash jq 2>/dev/null; then
# Use the jq command to safely parse json
bearerToken=$(echo $raw_json | jq -r '.access_token')
else
# Strip away all but the "access_token" field's value using a perl regular expression
bearerToken=$(echo $raw_json | grep -Po '"'"access_token"'"\s*:\s*"\K([^"]*)')
fi
由于并非所有regex风格都支持lookbehind，因此Perl通常在以下情况下引入了
\Ka\Kb
\K“access\u token”：“\K~$ echo 'hello world' | grep -oP 'hello \K(world)'
world
~$ echo 'hello world' | grep -oP 'hello (world)'
hello world
请注意，
grepbearerToken=$（echo“$raw_json”| jq.accessToken”）sudo-yum安装jq开头“access_token'foo'“bar”'baz'“foobarbaz”\zs