I need to match the following values and my current Regular Expression can't seem to get % values to be matched or numbers without - and $

Values I need a matched:

$123.45 - Match

-$123.45 - Match

123.45 - Needs Matched

-123.45 - Match

.99 - Needs Matched

-.99 - Match

7% - Needs Matched

-7% - Needs Matched

500 - Needs Matched

Regular Expression:

^[-$][$]?\d*(?:\.\d{0,2})?$

I need to match the following values and my current Regular Expression can't seem to get % values to be matched or numbers without - and $

Values I need a matched:

$123.45 - Match

-$123.45 - Match

123.45 - Needs Matched

-123.45 - Match

.99 - Needs Matched

-.99 - Match

7% - Needs Matched

-7% - Needs Matched

500 - Needs Matched

Regular Expression:

^[-$][$]?\d*(?:\.\d{0,2})?$

• javascript
• regex
• currency

Share Improve this question Follow edited Jun 20, 2020 at 9:12 CommunityBot 111 silver badge asked Dec 6, 2011 at 16:53 Zach LZach L 1,27544 gold badges1818 silver badges3737 bronze badges

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4 Answers 4

Sorted by: Reset to default 6

Here you go:

/^-?\$?[0-9]*\.?([0-9]{2})?%?$/

$str = " 
$123.45 - Match
-$123.45 - Match
123.45 - Needs Matched
-123.45 - Match
.99 - Needs Matched
-.99 - Match
7% - Needs Matched
-7% - Needs Matched
500 - Needs Matched
";

preg_match_all('#-?[$]?[0-9]*\.?[0-9]{2}+[%]?#i',$str, $res);
print_r($res);

This casts the web a little to wide though as it finds -$123.12% to be a number

/^-?\$?[0-9]*(\.?[0-9]{1,2})?%?$/

I adapted on akellehe's answer to match a range of currency symbols:

var regex = new RegExp("^-?[^0-9]?[0-9]*[0-9\u002e]+%?$");

and to capture the output for more analysis:

var regex = new RegExp("^(-?)([^0-9]?)([0-9]*[0-9\u002e]+)(%?)$");
// $1 captures the negative sign,
// $2 captures the currency symbol
// $3 captures the number
// $4 captures the percent sign