RegEx - 如何将百分比验证嵌入到我的货币验证中

Question

I need to validate a field that can be inputed as CURRENCY, or NUMERIC, or PERCENTAGE. I haven't seen any posts for ALL 3 conditions at once so wanted to ask the community.

I found the following code on here (thanks Gary!!) that works great for validating currency or numerics at the same time.
(?=.)^\\$?(([1-9][0-9]{0,2}(,[0-9]{3})*)|[0-9]+)?(\\.[0-9]{1,2})?$

Regex currency validation

How do you update this expresssion to validate for percentages as well? Basically I would like to allow a percent symbol at the very end IF
- they don't enter a dollar sign
- (if possible I'd like to also validate that if they enter a percent symbol then the value can't be over 100, but I can live w/o this validation)

Answer 1

I might think of a cleaner way to do it later, but for now this should work

(?!\$.+?%)(?=.*\d)^\$?(?:(?:0*[1-9]\d{0,2}(?:,\d{3})*)|0+\d*)?(?:\.\d{1,2})?%?$

It simply takes the regex you borrowed from me and adds

• An optional '%' at the end (in addition to the already optional '$' at the beginning): %? .
• A negative lookahead to check that it doesn't have both: (?!\\$.+?%)
• A positive lookahead to ensure that it has one or the other (since they were both optional): (?=\\$.+|.+%) make sure there's a number somewhere (since everything is individually optional): (?=.*\\d)