objective c - Regular Expression for validate price in decimal -

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i unable find workaround regular expression input price in decimal. want:-

12345

12345.1

12345.12

12345.123

.123

0.123

i want restrict digits.

i created 1 not validating assumed

^([0-9]{1,5}|([0-9]{1,5}\.([0-9]{1,3})))$

also want know how above expression different one

^([0-9]{1,5}|([0-9].([0-9]{1,3})))$ thats working fine.

anyone explanation.

"i using nsregularexpression - objective c" if helps answer more precisely

- (ibaction)btntapped {        nsregularexpression * regex = [nsregularexpression regularexpressionwithpattern:          @"^\\d{1,5}([.]\\d{1,3})?|[.]\\d{1,3}$" options:nsregularexpressioncaseinsensitive error:&error];       if ([regex numberofmatchesinstring:txtinput.text options:0 range:nsmakerange(0, [txtinput.text length])])           nslog(@"matched : %@",txtinput.text);      else         nslog(@"not matched : %@",txtinput.text); }

"i doing in buttontap method".

this simple 1 should suit needs:

\d*[.]?\d+

"digits (\d+) can preceded dot ([.]?), can preceded digits (\d*)."

since you're talking prices, neither scientific notation nor negative numbers necessary.

just point of interest, here's 1 used, scientific notation , negative numbers included:

[-+]?\d*[.]?\d+(?:[ee][-+]?\d+)?

for new requirements (cf. comments), can't specify how many digits want on first regex gave, since it's not way has been built.

this 1 should suit needs better:

\d{1,5}([.]\d{1,3})?|[.]\d{1,3}

"max 5 digits (\d{1,5}) possibly followed ((...)?) dot followed max 3 digits ([.]\d{1,3}), or (|) dot followed max 3 digits ([.]\d{1,3})".


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