Processing 1.0 - Processing Discourse - Parsing integer from a string

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Index › Programming Questions & Help › Syntax Questions › Parsing integer from a string

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Parsing integer from a string (Read 1461 times)

huiyingke YaBB Newbies Offline Posts: 5	Parsing integer from a string Feb 23^rd, 2010, 8:03pm Hi all, I have a question about parsing data. A string like "channel 11"; How can I parse the integer 11 from the string "channel 11" ? thanks for your help.

th0m YaBB Newbies Offline Posts: 16 Ohio, USA	Re: Parsing integer from a string Reply #1 - Feb 23^rd, 2010, 8:24pm http://processing.org/reference/split_.html http://processing.org/reference/int_.html String[] splitted = split("channel 11"); int eleven = int(splitted[1]);

th0m YaBB Newbies Offline Posts: 16 Ohio, USA	Re: Parsing integer from a string Reply #2 - Feb 23^rd, 2010, 8:26pm oh, but i guess, more useful would be if you don't know where the number is.... i would say in general one could split (if you know the number will always be surrounded by spaces), and then loop through each part of the split string such that you test each? i am not sure!

huiyingke YaBB Newbies Offline Posts: 5	Re: Parsing integer from a string Reply #3 - Feb 23^rd, 2010, 10:07pm thank you so much for your help. already solved. Have a nice day

PhiLho YaBB Moderator Offline Posts: 4190 Near Paris (France)	Re: Parsing integer from a string Reply #4 - Feb 23^rd, 2010, 11:27pm th0m: you can use a regular expression to isolate a number in a string.

Krzysztof Trzewiczek

Re: Parsing integer from a string
Reply #5 - Feb 24^th, 2010, 2:52am

you can always use try/catch Wink

Quote:

int myInt;
String[] subStrings = split( "john is a happy 11 number", ' ' );

for( int i = 0; i < subStrings.length; ++i )
{
  try
  {
    myInt = int( subStrings[i] );
  }
  catch(NumberFormatException e)
  {
    // do what you want to do with it
  }

}

You can use break in try block to protect yourself in case of more then one number exists in the string. Then after the first one you quit the for loop.

Be careful with split, btw. If your string will be something like:

String[] subStrings = split( "john is a happy 11, isn't he?", ' ' );

then you won't get a number as a substring after splitting would be

"11,"

which wouldn't parse into int and would throw exception!

PhiLho YaBB Moderator Offline Posts: 4190 Near Paris (France)	Re: Parsing integer from a string Reply #6 - Feb 24^th, 2010, 4:58am Example with regular expression: Code: String sentence = "John is a happy 11, isn't he? U2."; String[] m = match(sentence, "\\d+"); if (m != null) // Found! { println(m[0]); }

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