public static Selector expressionSelector(String expr, EvaluationContext evalCtx, SpelCompilerMode mode) {
        SpelParserConfiguration configuration = new SpelParserConfiguration(mode, null);
        SpelExpressionParser parser = new SpelExpressionParser(configuration);
        return new ExpressionSelector(parser.parseExpression(expr), evalCtx);
    }
public static Selector expressionSelector(String expr, EvaluationContext evalCtx, SpelCompilerMode mode) {
        SpelParserConfiguration configuration = new SpelParserConfiguration(mode, null);
        SpelExpressionParser parser = new SpelExpressionParser(configuration);
        return new ExpressionSelector(parser.parseExpression(expr), evalCtx);
    }
public static Selector expressionSelector ( String expr , EvaluationContext evalCtx , SpelCompilerMode mode ) { SpelParserConfiguration configuration = new SpelParserConfiguration ( mode , null ) ; SpelExpressionParser parser = new SpelExpressionParser ( configuration ) ; return new ExpressionSelector ( parser . parseExpression ( expr ) , evalCtx ) ; }
Helper method for creating an {@code ExpressionSelector}.

@param expr
The expression to parse.
@param evalCtx
The {@link org.springframework.expression.EvaluationContext} to use.
@param mode
The {@link org.springframework.expression.spel.SpelCompilerMode} to use.

@return A new {@link reactor.bus.selector.Selector}
Helper method for creating an { @code ExpressionSelector } .