The next if statement will remove the trailing "any word character section" to produce (s)(\w)+(m)(\w)+(l).
接下来的 if 语句将删除后置的 “任何字符部分” 以生成 (s)(\w)+(m)(\w)+(l)。
2
Xie C. -X. , Meng M. , Zeng W. -J. , Zhong L. , Wei C. -X. , Luo J. Biomechanics and biocompatibility of cardiovascular stent materials and restenosis following stent implantation.
谢潮鑫，孟猛，曾伟杰，钟磊，魏春霞，罗佼心血管支架材料生物力学及生物相容性与支架置入后血管再狭窄。
3
Zhao M G, Yu WL. Crystal field theory. Chengdu:Sichuan Education Press, 1988.239~241