bundles/org.apache.jasper.glassfish/src/org/apache/jasper/compiler/JspUtil.java
public static boolean isExpression(String token, boolean isXml) {
	String openExpr;
	String closeExpr;
	if (isXml) {
	    openExpr = OPEN_EXPR_XML;
	    closeExpr = CLOSE_EXPR_XML;
	} else {
	    openExpr = OPEN_EXPR;
	    closeExpr = CLOSE_EXPR;
	}
	if (token.startsWith(openExpr) && token.endsWith(closeExpr)) {
	    return true;
	} else {
	    return false;
	}
    }
public static boolean isExpression(String token, boolean isXml) {
	String openExpr;
	String closeExpr;
	if (isXml) {
	    openExpr = OPEN_EXPR_XML;
	    closeExpr = CLOSE_EXPR_XML;
	} else {
	    openExpr = OPEN_EXPR;
	    closeExpr = CLOSE_EXPR;
	}
	if (token.startsWith(openExpr) && token.endsWith(closeExpr)) {
	    return true;
	} else {
	    return false;
	}
    }
Checks if the token is a runtime expression.
In standard JSP syntax, a runtime expression starts with '<%' and
ends with '%>'. When the JSP document is in XML syntax, a runtime
expression starts with '%=' and ends with '%'.

@param token The token to be checked
return whether the token is a runtime expression or not.