Regular Expression - Decimal

Question

Is it possible to extract positive integers, negative integers, positive decimal number and negative decimal number using Regex?

I have been using -\d+ regular expression to get both positive and negative numbers.

Valid Numbers:

-1
-1.0 
1
1.0

Please refer http://stackoverflow.com/questions/2072222/regular-expression-for-positive-and-a-negative-decimal-value-in-java — Mayank Jain, May 18 '13 at 08:03
http://stackoverflow.com/questions/308122/simple-regular-expression-for-a-decimal-with-a-precision-of-2 - maybe it will help you? — Fisk, May 18 '13 at 08:05

MofX · Accepted Answer · 2013-05-18T08:16:38.433

3

The regex

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

would accept numbers like

1123
1.00
+123213
-123.234324

if you also like to match numbers like .23 you have can use

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

edited May 18 '13 at 08:16

answered May 18 '13 at 08:03

MofX

how would i check for JUST "special characters" like "-" or "+"? – user2301717 May 18 '13 at 08:27
You only want to match - or +? just use [+-] – MofX May 18 '13 at 08:29

It'sNotALie. · Answer 2 · 2013-05-18T17:19:14.880

0

I would try something like:

^[+-]?(\d+(\.?\d+)?|\.\d+)$

Matches all your examples, and numbers like:

edited May 18 '13 at 17:19

answered May 18 '13 at 08:33

It'sNotALie.

2 Answers2