[GitHub] [commons-lang] muriloalvesdev commented on a change in pull request #595: Add method to remove all numbers from a String

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muriloalvesdev commented on a change in pull request #595:
URL: https://github.com/apache/commons-lang/pull/595#discussion_r463409756



##########
File path: src/main/java/org/apache/commons/lang3/StringUtils.java
##########
@@ -221,6 +226,27 @@ public static String abbreviate(final String str, final int maxWidth) {
         return abbreviate(str, "...", 0, maxWidth);
     }
 
+    /**
+     * <p>Removes any number contained in a String using Regex.</p>
+     *
+     * <pre>
+     * StringUtils.removeAllNumbers(null)        = ""
+     * StringUtils.removeAllNumbers("")          = ""
+     * StringUtils.removeAllNumbers(" ")         = ""
+     * StringUtils.removeAllNumbers("123abc")    = "abc"
+     * StringUtils.removeAllNumbers("123a b c")  = "a b c"
+     * StringUtils.removeAllNumbers("abc123")    = "abc"
+     * StringUtils.removeAllNumbers("123abc123") = "abc"
+     * StringUtils.removeAllNumbers("a1b2c3")    = "abc"
+     * </pre>
+     * 
+     * @param str String to check, may be null
+     * @return The String without the numbers
+     */
+    public static String removeAllNumbers(String str) {
+      return !isBlank(str) ? str.replaceAll(REGEX_FIND_NUMBERS, EMPTY) : EMPTY;

Review comment:
       Hello XenoAmess!
   
   My English is unfortunately still intermediate, did you suggest that I do this validation manually?
   
   Was it something like that?
   
   ```
   public static String removeAllNumbers(String str) {
           String result = "";
           if(!isEmpty(str)) {
             char[] array = str.toCharArray();
             for(int i = 0 ; i < array.length; i++) {
                 if(!Character.isDigit(array[i])) {
                   result += array[i];
                 }
             }
             return result;
           }
           return str;
   }
   ```




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