Regex number amount validation

问题

I want to validate the amount with the below scenario. The below regex is working except ',' for example 1,000.0000

^(?!0*(\.0+)?$)(\d*(?:\.[0-9]{0,4})?)$

1 - should pass
0.1 - should pass
.1 - should pass
0 - should fail
.0001 - should pass
.10 - should pass
0.0  - should fail
0.00000 - should fail (only accept 4 digits after the decimal point)
1.0000 - should pass
1,000.0000 - should pass
1,000,00.000 - should pass
1,000.0000 - should pass

回答1:

^(?![0,]*(\.0+)?$)([,\d]*(?:\.[0-9]{0,4})?)$. I simply replaced the \d before the decimal separator with [,\d]; and also in the negative assertion, so that 0,000.00 doesn't match. It allows any number of commas placed everywhere, and this is reasonable, because local traditions of grouping digits differ.

Also, do you want numbers with hanging dots, like 10. to match? If not, replace {0,4} with {1,4}. https://regex101.com/r/XB8OtL/3.

回答2:

Changing the last ? (zero or one repetition) with a * (any number of repetitions) (so ^(?!0*(.0+)?$)(\d*(?:.[0-9]{0,4})*)$) will validate the inputs that should validate (it's the repetition of the ,000 or .000 that fails the test). By the way your regex could be improved: because you use . (any character) instead of \. (dot) or ',' coma, your regex ie validate bad inputs like '1x0000' or '1#0000' (any character)

来源：https://stackoverflow.com/questions/64385300/regex-number-amount-validation

标签

regex