How to check if a String contains a digit?

Question

I want to check if a string contain a digit in jsp .I know how to do this in java but don't know how to do this in jsp ? Can anyone help me?

firstNumber.matches("[0-9]{1,13}(\\.[0-9]*)?")

Answer 1

JSP is Java (more or less):

<% if (firstNumber.matches(".*[0-9].*")) {
       // do something
%>

Answer 2

Why not use Expression Language constructs?

   <c:set var="myValue">${firstNumber}</c:set>
    <c:choose>
      <c:when test="${myValue.matches('.*[0-9].*')}">
        ${var} contains number!
      </c:when>
      <c:otherwise>
        <!--do something-->
       </c:otherwise>
   </c:choose>

Answer 3

尝试使用此检查：

 <c:if test='${firstNumber.matches(".*[0-9].*")}'>

Answer 4

You can use a regex to find out if the String contains a number. Take a look at the matches() method

<%@ page import="java.util.regex.*" %>

<% if(firstNumber.matches(".*\\d.*")){
   // contains a number
  } %>