在学习源码时，发现ObExprRegexContext类使用了icu的正则库，但是项目源码中并没有找到关于icu正则库的源码，想问一下icu正则库是包含在哪个文件夹下？
由于依赖的组件相对比较大，不再像之前把正则表达式库放到源码中，我们把 Unicode ICU 正则表达式库打包为第三方依赖进行管理。
[xiaofeng.lby@obvos-dev-d3 /home/xiaofeng.lby/work/obn/code_master]
$cd deps/ini
[xiaofeng.lby@obvos-dev-d3 /home/xiaofeng.lby/work/obn/code_master/deps/init]
$ls
dep_create.sh oceanbase.el7.aarch64.deps oceanbase.el7.aarch64.deps.opensource oceanbase.el7.x86_64.deps oceanbase.el7.x86_64.deps.opensource oceanbase.el8.aarch64.deps.opensource oceanbase.el8.x86_64.deps.opensource
[xiaofeng.lby@obvos-dev-d3 /home/xiaofeng.lby/work/obn/code_master/deps/init]
$git grep icu
oceanbase.el7.aarch64.deps:devdeps-icu-69.1-72022112416.el7.aarch64.rpm
oceanbase.el7.aarch64.deps.opensource:devdeps-icu-69.1-72022112416.el7.aarch64.rpm
oceanbase.el7.x86_64.deps:devdeps-icu-69.1-72022112416.el7.x86_64.rpm
oceanbase.el7.x86_64.deps.opensource:devdeps-icu-69.1-72022112416.el7.x86_64.rpm
oceanbase.el8.aarch64.deps.opensource:devdeps-icu-69.1-72022112416.el8.aarch64.rpm
oceanbase.el8.x86_64.deps.opensource:devdeps-icu-69.1-72022112416.el8.x86_64.rpm
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