UKismetStringLibrary::IsNumeric

function Engine Blueprint Since unknown

#include "Kismet/KismetStringLibrary.h"

Access: public Specifiers: staticBlueprintPure

Description

Checks whether a string contains only numeric characters. Commonly used to validate user text input before converting it with Conv_StringToInt or Conv_StringToDouble.

Caveats & Gotchas

• An empty string returns false, not true — don't assume IsNumeric implies non-empty content elsewhere without checking.
• Accepts a single leading '+' or '-' sign and one decimal point, so "-3.14" passes; it is not a strict integer check.

Signature

static bool IsNumeric(const FString& SourceString)

Parameters

Name	Type	Description	Default
SourceString	const FString&	The string to check.	—

Return Type

bool

Example

Validate before conversion C++

if (UKismetStringLibrary::IsNumeric(UserInput))
{
    const double Value = UKismetStringLibrary::Conv_StringToDouble(UserInput);
}

Version History

Introduced in: unknown

Version	Status	Notes
5.6	stable	—

Feedback

Was this helpful?