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A regular expression (regex or regexp
for short) is a special text string for describing
a search pattern. You can think of regular expressions
as wildcards on steroids. You are probably familiar
with wildcard notations such as *.txt to find
all text files in a file manager. The regex equivalent
is .*\.txt$.
But you can do much more with regular
expressions. In a text editor like EditPad Pro
or a specialized text processing tool like PowerGREP,
you could use the regular expression \b[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}\b
to search for an email address. Any email address,
to be exact. A very similar regular expression
(replace the first \b with ^ and the last one
with $) can be used by a programmer to check if
the user entered a properly formatted email address.
In just one line of code, whether that code is
written in Perl, PHP, Java, a .NET language or
a multitude of other languages.
var textVal = "";
var refString = "/\:*%#@!^&<>|';$~`";
var refStr = "[/\\\\:*%#@!^&<>|';$~`]";
*
var regExp = new RegExp(refStr);
textVal = this._tfName.getText(); //getting value
from a text field and setting in textVal.
textVal = textVal.trim();
if(textVal != ""){
if(regExp.test(textVal)){
this._tfName.setText("");
return;
}
}
* one
of the foward slash is used to escape the back
slash
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