control-characters

I was experimenting with '\' characters, using '\a\b\c...' just to enumerate for myself which characters Python interprets as control characters, and to what. Here's what I found: \a - BELL \b - BACKSPACE \f - FORMFEED \n - LINEFEED \r - RETURN \t - TAB \v - VERTICAL TAB Most of the other characters I tried, '\g', '\s', etc. just evaluate to the 2-character string of a backslash and the given character. I understand this is intentional, and makes sense to me. But '\x' is a problem. When my script reaches this source line: val = "\x" I get: ValueError: invalid \x escape What is so special about

My JavaScript is quite rusty so any help with this would be great. I have a requirement to detect non printable characters (control characters like SOH, BS etc) as well extended ascii characters such as Ž in a string and remove them but I am not sure how to write the code? Can anyone point me in the right direction for how to go about this? This is what I have so far: $(document).ready(function() { $('.jsTextArea').blur(function() { var pattern = /[^\000-\031]+/gi; var val = $(this).val(); if (pattern.test(val)) { for (var i = 0; i < val.length; i++) { var res = val.charAt([i]); alert(

In the book Fortran 95/2003 for Scientists and Engineers , there is much talk given to the importance of recognizing that the first column in a format statement is reserved for control characters. I've also seen control characters referred to as carriage control on the internet. To avoid confusion, by control characters, I refer to the characters "1, a blank (i.e. \s), 0, and +" as having an effect on the vertical spacing of output when placed in the first column (character) of a FORMAT statement. Also, see this text-only web page written entirely in fixed-width typeface : Fortran carriage

I am trying to find the values that my local system assigns to the arrow keys, specifically in Python. I am using the following script to do this: import sys,tty,termios class _Getch: def __call__(self): fd = sys.stdin.fileno() old_settings = termios.tcgetattr(fd) try: tty.setraw(sys.stdin.fileno()) ch = sys.stdin.read(1) finally: termios.tcsetattr(fd, termios.TCSADRAIN, old_settings) return ch def get(): inkey = _Getch() while(1): k=inkey() if k!='':break print 'you pressed', ord(k) def main(): for i in range(0,25): get() if __name__=='__main__': main() Then I ran the script, and hit UP DOWN