_Added in 4.3_

*$isnum(text [, cdens])*

Returns [[$true]] if the text is a number, otherwise [[$false]].

_Same as [[$isnumber]]._

*Parameters*

table(ktable).
|*Parameter*|*Description*|
| c | Enables 's' and 'd', partial TODO |
| d | Allows decimal numbers. |
| e | Allows scientific (exponential) notations. |
| n | Allows regular numbers. |
| s | Allows leading + and minus signs. |

*Example*

<pre>
; Returns $false
//echo -ag $isnum(abc)

; Returns $true
//echo -ag $isnum(555)
</pre>