China DOS Union

-- Unite DOS · Advance DOS · Grow DOS --
Union site: www.cn-dos.net　Forum site: www.cn-dos.net/forum

中国DOS联盟论坛
The time now is 2026-09-23 17:55

47,812 topics / 349,917 posts / today 0 new / 48,274 members

DOS批处理 & 脚本技术（批处理室） » [Question] Looking for a regex for file extensions

Floor1　electronixtar	Posted 2006-05-23 17:44
铂金会员　Posts 2,672　Credits 7,493
Given a filename, I need to extract the file's extension, for example: test.htm, get htm. But what if there are multiple . ? For example test.2006.5.23.html, in the end I also need to get html. Please help, experts! Thanks!

Floor2　Climbing	Posted 2006-05-23 18:38
铂金会员　Posts 2,753　Credits 6,962　From 河北保定
What environment are you running in, classmate? What are the constraints? Seems like there was already an example of this earlier.

Floor3　electronixtar	Posted 2006-05-23 19:03
铂金会员　Posts 2,672　Credits 7,493
I'm talking about vbs I think regexes are all basically universal, right?～～ My runtime environment: WSH5.6,WinXP sp2 IE6+maxthon1.5.2 cmd.exe 5.1.2600.2180(xpsp_sp2_rtm.040803-2158) p.s. I hope an expert can also give me a regex to get the part before the file extension～～ I'm really too dumb to write it myself! Thanks, thanks!

Floor4　无奈何	Posted 2006-05-23 19:29
荣誉版主　Posts 356　Credits 1,338
Brother electronixtar, I guess maybe you're overthinking it. In regex, the expression will get the maximum match, and that happens to fit the requirement for an extension: the characters after the last “.” are the extension. (.)\.(.) \1 gets the filename. \2 gets the extension.

Floor5　electronixtar	Posted 2006-05-23 19:37
铂金会员　Posts 2,672　Credits 7,493
Heh～～～it really is If you don't use regex for a long time, naturally you forget it completely～～～cramming hard now [ Last edited by electronixtar on 2006-5-23 at 19:39 ]