How to check if the string is a regular expression or not

[ekaku]

Hi team.
I have a string in TextItem.
How I can check if the string is a regular expression or contains regular expression or it is a normal string?(In client side )
Can you give me some idea.

[Isomorphic]

https://stackoverflow.com/questions/...ssion/17251034

[ekaku]

Thanks for your reply.
I got to use RegEx.
In that code is not work ,Can you tell me what is miss?

import com.smartgwt.client.widgets.form.validator.CustomValidator;

public class StringIsRegexValidator extends CustomValidator {

/*
* (non-Javadoc)
*
* @see
* com.smartgwt.client.widgets.form.validator.CustomValidator#condition(java.
* lang.Object)
*/
@Override
protected boolean condition(Object value) {

if (value == null || value.toString().isEmpty()) {
this.setErrorMessage("is Empty");
return false;//Maybe Is not necessary here?
}
final String pattern = value.toString().trim();

if (!StringIsRegexValidator.checkRegExp(pattern)) {
this.setErrorMessage("is not Regex");
return false;
}
return true;
}
public static native boolean checkRegExp(String pattern) /*-{
try {
$RegExp(pattern);
return true;
} catch(e) {
return false;
}
}-*/;
}