| /* |
| String indexOf() and lastIndexOf() functions |
| |
| Examples of how to evaluate, look for, and replace characters in a String |
| |
| created 27 July 2010 |
| modified 2 Apr 2012 |
| by Tom Igoe |
| |
| http://arduino.cc/en/Tutorial/StringIndexOf |
| |
| This example code is in the public domain. |
| */ |
| |
| void setup() { |
| // Open serial communications and wait for port to open: |
| Serial.begin(9600); |
| while (!Serial) { |
| ; // wait for serial port to connect. Needed for Leonardo only |
| } |
| |
| // send an intro: |
| Serial.println("\n\nString indexOf() and lastIndexOf() functions:"); |
| Serial.println(); |
| } |
| |
| void loop() { |
| // indexOf() returns the position (i.e. index) of a particular character |
| // in a string. For example, if you were parsing HTML tags, you could use it: |
| String stringOne = "<HTML><HEAD><BODY>"; |
| int firstClosingBracket = stringOne.indexOf('>'); |
| Serial.println("The index of > in the string " + stringOne + " is " + firstClosingBracket); |
| |
| stringOne = "<HTML><HEAD><BODY>"; |
| int secondOpeningBracket = firstClosingBracket + 1; |
| int secondClosingBracket = stringOne.indexOf('>', secondOpeningBracket ); |
| Serial.println("The index of the second > in the string " + stringOne + " is " + secondClosingBracket); |
| |
| // you can also use indexOf() to search for Strings: |
| stringOne = "<HTML><HEAD><BODY>"; |
| int bodyTag = stringOne.indexOf("<BODY>"); |
| Serial.println("The index of the body tag in the string " + stringOne + " is " + bodyTag); |
| |
| stringOne = "<UL><LI>item<LI>item<LI>item</UL>"; |
| int firstListItem = stringOne.indexOf("<LI>"); |
| int secondListItem = stringOne.indexOf("item", firstListItem + 1 ); |
| Serial.println("The index of the second list item in the string " + stringOne + " is " + secondClosingBracket); |
| |
| // lastIndexOf() gives you the last occurrence of a character or string: |
| int lastOpeningBracket = stringOne.lastIndexOf('<'); |
| Serial.println("The index of the last < in the string " + stringOne + " is " + lastOpeningBracket); |
| |
| int lastListItem = stringOne.lastIndexOf("<LI>"); |
| Serial.println("The index of the last list item in the string " + stringOne + " is " + lastListItem); |
| |
| |
| // lastIndexOf() can also search for a string: |
| stringOne = "<p>Lorem ipsum dolor sit amet</p><p>Ipsem</p><p>Quod</p>"; |
| int lastParagraph = stringOne.lastIndexOf("<p"); |
| int secondLastGraf = stringOne.lastIndexOf("<p", lastParagraph - 1); |
| Serial.println("The index of the second last paragraph tag " + stringOne + " is " + secondLastGraf); |
| |
| // do nothing while true: |
| while(true); |
| } |
| |
