问题
I'm using: http://firstopinion.github.io/formatter.js/index.html to mask inputs.
I'm looking at "patterns" option and am having trouble writing the regex expression for 1 or 2 digits with an optional decimal place.
Good inputs:
2.5
12.5
.5
1
Bad inputs:
.25
123.5
1.55
Thank you for any help!
回答1:
^\d{0,2}(?:\.\d)?$
\d{0,2}= 0-2 digits\.\d= decimal point followed by 1 digit(?: ... )?= optional group^and$anchor it to beginning and end
DEMO
来源：https://stackoverflow.com/questions/23705423/regex-for-1-or-2-digits-with-one-optional-decimal-place