There are two steps to create a custom function for JSP: Declare the function in the TLD: <?xml version="1.0" encoding="UTF-8" ?> <taglib... Implement the function (must be static): package com.example; public class UrlTransl... To use the function: <%@ taglib uri="http://www.example.com/jsp/tags" p...

Behavior for functions substringBefore and substringAfter are well defined when the string to look for exists. But what happens when the substring is not found? Do they return the whole string or empty string? Code: <p>substringBefore('a.b', '.'): #{fn:substringBefo... Result: substringBefore('a.b', '.'): a substringBef...

Experts may disagree but I found it absolutely stunning that JSF EL does not provide an operator for string concatenation. The Java "+" operator is there for the take. Java, which is a strongly typed compiled language, overloads the "+" operator in such a way that any object can be concatenated with a string. But JSF EL, which definitely isn't as strongly typed as Java, restricts the "+" operator to numerical values only! Of course, experts may argue that the "+" operator overloading is a huge design flaw of the Java language. But even so, JSF EL is not the right place to fix it! In some cases, a concatenation operator isn't needed, for example: <ui:repeat var="tab" value="#{tabs}"> <img ... But in case the concatenated...

Facelet taglib schema from JavaServer Faces Spec 2.0: <xsd:schema targetNamespace="http://java.sun.com/x...

A pair of C functions convert between an Internet address and a string (ASCII): #include <arpa/inet.h> /* * Returns a poin... However , these functions do not support IPv6. The new pair is: #include <arpa/inet.h> /* Convert a Internet ad... Examples: #include <sys/socket.h> #include <netinet/in.h>...

Use the sub function in the re module to do global replacement: import re re.sub(pattern, replacement, inpu...

The String.trim function trims spaces from both ends. There's no built-in function to trim only the right side or left side. To right trim: String trimmed = original.replaceAll("\\s+$", ""); To left trim: String trimmed = original.replaceAll("^\\s+", "");

The PHP function file_get_contents reads the entire contents of a file into a string, while the function file reads a file into an array. file_get_contents('filename') is equivalent to implode('', file('filename')) : <?php // reads entire file into array, one elem...

The PHP function strval returns the string value of a variable. It does the same thing as casting a variable to string, or automatic conversion where string is expected. Conversion rules: Type String Value Boolean TRUE '1' Boolean FALSE '' (empty string) integer of float string representing the number Array The string 'Array' Object Result of __toString() if defined, error otherwise Resource 'Resource id #n' , where n is a number assigned to the resource. NULL '' (empty string) Example: <?php set_error_handler(function($errno, $errst... Results: bool(true) --------------------- strval: '1'...

The PHP function ctype_digit returns true when all characters in a string is numeric. Use this function only on strings. You get unexpected results with other data types. Example: <?php $a = array("124.34", "00088760", "1.3e5",... Results: string(6) "124.34" ----------------- ctype_d...