Tutorial by Examples: char

Finding character(s) in a string

To find a character or another string, you can use std::string::find. It returns the position of the first character of the first match. If no matches were found, the function returns std::string::npos std::string str = "Curiosity killed the cat"; auto it = str.find("cat"); ...

C++ • std::string

Basic Character Replacement with STUFF()

The STUFF() function inserts a string into another string by first deleting a specified number of characters. The following example, deletes "Svr" and replaces it with "Server". This happens by specifying the start_position and length of the replacement. SELECT STUFF('SQL Svr D...

Microsoft SQL Server • The STUFF Function

Newlines and control characters

A newline can be included in a single-string or double-quoted string. Note that backslash-newline does not result in a newline, the line break is ignored. newline1=' ' newline2=" " newline3=$'\n' empty=\ echo "Line${newline1}break" echo "Line${newline2}break" ...

Bash • Quoting

Verbatim strings instruct the compiler to not use character escapes

In a normal string, the backslash character is the escape character, which instructs the compiler to look at the next character(s) to determine the actual character in the string. (Full list of character escapes) In verbatim strings, there are no character escapes (except for "" which is ...

C# Language • Verbatim Strings

Trimming characters at start/end

This example requires the headers <algorithm>, <locale>, and <utility>. C++11 To trim a sequence or string means to remove all leading and trailing elements (or characters) matching a certain predicate. We first trim the trailing elements, because it doesn't involve moving any el...

C++ • std::string

Single character match

To broaden the selections of a structured query language (SQL-SELECT) statement, wildcard characters, the percent sign (%) and the underscore (_), can be used. The _ (underscore) character can be used as a wildcard for any single character in a pattern match. Find all employees whose Fname start w...

SQL • LIKE operator

Select columns which are named after reserved keywords

When a column name matches a reserved keyword, standard SQL requires that you enclose it in double quotation marks: SELECT "ORDER", ID FROM ORDERS Note that it makes the column name case-sensitive. Some DBMSes have proprietary ways of quoting names. For example, SQL Serve...

SQL • SELECT

Escaping @ character

In many cases, the Razor parser is smart enough to figure out when the @ sign is meant to be used as part of code, as opposed to being part of something like an email address. In the example below, escaping the @ sign is not necessary: <p>Reach out to us at [email protected]</p> Howev...

asp.net-mvc • Razor

What you see is NOT what you get: char vs cellstring in the command window

This a basic example aimed at new users. It does not focus on explaining the difference between char and cellstring. It might happen that you want to get rid of the ' in your strings, although you never added them. In fact, those are artifacts that the command window uses to distinguish between ...

MATLAB Language • Common mistakes and errors

CHAR and VARCHAR

String data types of either fixed length or variable length. Syntax: CHAR [ ( n_chars ) ] VARCHAR [ ( n_chars ) ] Examples: SELECT CAST('ABC' AS CHAR(10)) -- 'ABC ' (padded with spaces on the right) SELECT CAST('ABC' AS VARCHAR(10)) -- 'ABC' (no padding due to variable character) SELE...

SQL • Data Types

NCHAR and NVARCHAR

UNICODE string data types of either fixed length or variable length. Syntax: NCHAR [ ( n_chars ) ] NVARCHAR [ ( n_chars | MAX ) ] Use MAX for very long strings that may exceed 8000 characters.

SQL • Data Types

Simple Bar Chart

index.html <!doctype html> <html> <head> <title>D3 Sample</title> </head> <body>  <div id=...

d3.js • Getting started with d3.js

Character Guide

Note that some syntax elements have different behavior depending on the expression. SyntaxDescription?Match the preceding character or subexpression 0 or 1 times. Also used for non-capturing groups, and named capturing groups.*Match the preceding character or subexpression 0 or more times.+Match th...

Regular Expressions • Getting started with Regular Expressions

Character Encoding

The charset attribute specifies the character encoding for the HTML document and needs to be a valid character encoding (examples include windows-1252, ISO-8859-2, Shift_JIS, and UTF-8). UTF-8 (Unicode) is the most widely used and should be used for any new project. 5 <meta charset="UTF-8...

HTML • Meta Information

Char Lists

Strings in Elixir are "binaries". However, in Erlang code, strings are traditionally "char lists", so when calling Erlang functions, you may have to use char lists instead of regular Elixir strings. While regular strings are written using double quotes ", char lists are wr...

Elixir Language • Lists

Character types cannot be accessed through non-character types.

If an object is defined with static, thread, or automatic storage duration, and it has a character type, either: char, unsigned char, or signed char, it may not be accessed by a non-character type. In the below example a char array is reinterpreted as the type int, and the behavior is undefined on e...

C Language • Aliasing and effective type

Char might be unsigned or signed

The standard doesn't specify if char should be signed or unsigned. Different compilers implement it differently, or might allow to change it using a command line switch.

C++ • Implementation-defined behavior

Find first/last occurrence of a specific character: strchr(), strrchr()

The strchr and strrchr functions find a character in a string, that is in a NUL-terminated character array. strchr return a pointer to the first occurrence and strrchr to the last one. #include <stdio.h> #include <stdlib.h> #include <string.h> int main(void) { char toSe...

C Language • Strings

Counting occurrences of a substring or character in a string

countMatches method from org.apache.commons.lang3.StringUtils is typically used to count occurences of a substring or character in a String: import org.apache.commons.lang3.StringUtils; String text = "One fish, two fish, red fish, blue fish"; // count occurrences of a substring Str...

Java Language • Strings

str.translate: Translating characters in a string

Python supports a translate method on the str type which allows you to specify the translation table (used for replacements) as well as any characters which should be deleted in the process. str.translate(table[, deletechars]) ParameterDescriptiontableIt is a lookup table that defines the mappin...

Python Language • String Methods