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More on Regular Expressions!

without comments

i was trying to understand what’s happening behind scenes in the Log Class in Flex Framework
if you digg a little bit in their Classes you’ll find something like this

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                public function debug(msg:String, ... rest):void
		{
			if (hasEventListener(LogEvent.LOG))
			{
				// replace all of the parameters in the msg string
				for (var i:int = 0; i < rest.length; i++)
				{
					msg = msg.replace(new RegExp("\\{"+i+"\\}", "g"), rest[i]);
				}
 
				dispatchEvent(new LogEvent(msg, LogEventLevel.DEBUG));
			}
		}

so what’s means msg = msg.replace(new RegExp(”\\{”+i+”\\}”, “g”), rest[i]); ??????
that means whenever you find “{0}” …. “{n}” replace it by the string rest[0] … rest[n]

so you can use

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Log.debug("the song says {0} little {1} little {2} little-endians" , 'zero','one','two');
//outputs:  the song says zero little one little two little-endians

for me is so hard to read a Regular Expressions especially because i always forget
all means of meta characters and meta secquencies hehehe

Written by Raúl

December 14th, 2009 at 6:05 pm

Posted in AS3, General

Tagged with

Validating a String

without comments

well this is a handy code snippet to validate a string
if you want to avoid some bad words, this is for you:

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function isValid(str:String):Boolean {
        var regExp:RegExp = /\b(badword|nastyWord)\b/i;
	var _isValid:Boolean = !regExp.test(str);
        return _isValid;
}
 
var _inValidMessage = "this is a example for a bad badword it's really nasty";
var _validMessage = "Hello Word!";
 
trace(isValid(_inValidMessage)) //false
trace(isValid(_validMessage))//true

you can add more words just separating them by a pipeline ( | ) in the Regular Expression

Cheers.

Written by Raúl

April 6th, 2009 at 4:27 pm

Posted in AS3, General

Tagged with