Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
1.1k views
in Technique[技术] by (71.8m points)

asp.net - regular expression to allow only specific numbers

I am looking to have a regular expression that allows only specific numbers to be entered, e.g. 2,4,5,6,10,18

I tried something like

"'2'|'4'|'5'|'6'|'10'|'18'"

and anything that i typed failed the regex and then the computer pointed its finger at me and laughed.

where am i going wrong?

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

The single quotes are unnecessary. The regex you are looking for is: ^(2|4|5|6|10|18)$.

The symbols ^ and $ denote the start and the end of the line, to prevent 121 from matching (since it contains 2).


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

1.4m articles

1.4m replys

5 comments

57.0k users

...