JAVASCRIPT

3.4.2. Two Special Characters¶

console.log("Some Programming Languages:");

console.log("Python
JavaScript
Java
C#
Swift");

/*For the computer, newline is an invisible character that is used
to tell the machine to move to the next line. It is possible to use this
invisible character with the special representation 
.
In addition to the newline character, there is also a special tab 
character, 	. Go back to the eight examples above and experiment 
with using 	 and 
./*

3.4.2. Two Special Characters¶

import re
def checkvalid(string1):
    if re.search(r'[d.]s+[d.]', string1): return False # two numbers separated by spaces
    string1 = string1.replace(' ', '')
    return (bool(re.search(r'd', string1))               # must contain numbers
        and not re.search(r'.d*.', string1)            # a number can't contain two dots
        and not re.search(r'[$^]{2}|#[$^]|[$^]#[$^#]', string1) # obviously
        and not re.search(r'^[$^]|[$^]$', string1)        # special at the beginning or end
        and not re.search(r'^##|##$', string1)            # two hashes at the beginning or end
    )