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I have a Regular Expression of<br />
<br />
/[^.0-9]+/g<br />
<br />
to allow only number characters including decimals<br />
<br />
However I need to prevent negative numbers and also need to allow only up to 4 points precision for the decimal.<br />
<br />
I am not great at regular expressions, how would I change this?
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I have a Regular Expression of

/[^.0-9]+/g

to allow only number characters including decimals

However I need to prevent negative numbers and also need to allow only up to 4 points precision for the decimal.

I am not great at regular expressions, how would I change this?

Regular Expressions Question RegEx

A regular expression ("regex") is a sequence of characters that define a search pattern, mainly for use in pattern matching with strings, or string matching, i.e. "find and replace"-like operations. Regular expression processors are found in several search engines, search and replace dialogs of several word processors and text editors, and in the command lines of text processing utilities, such as sed and AWK. Many programming languages provide regular expression capabilities, some built-in, for example Perl, JavaScript, Ruby, AWK, and Tcl, and others via a standard library, for example .NET languages, Java, Python and C++ (since C++11). Most other languages offer regular expressions via a library.