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Check if string follows order of characters defined by a pattern or not | Set 2 | Python3 program to check if characters of a string follow pattern defined by given pattern ..
Insert all characters of pattern in a hash set ,.
Build modified string ( string with characters only from pattern are taken ).
Remove more than one consecutive occurrences of pattern characters from modified string ..
After above modifications , the length of modified string must be same as pattern length.
And pattern characters must also be same as modified string characters.
Driver Code"
Solution in Python:

What is a code to check if string follows order of characters defined by a pattern or not and the other steps required?
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#Here is code to check if string follows order of characters defined by a pattern or not and the other steps required.
 def followsPattern ( string , pattern ) :
	patternSet = set ( )
	for i in range ( len ( pattern ) ) :
		patternSet . add ( pattern [ i ] )
	modifiedString = string
	for i in range ( len ( string ) - 1 , - 1 , - 1 ) :
		if not modifiedString [ i ] in patternSet :
			modifiedString = modifiedString [ : i ] + modifiedString [ i + 1 : ]
	for i in range ( len ( modifiedString ) - 1 , 0 , - 1 ) :
		if modifiedString [ i ] == modifiedString [ i - 1 ] :
			modifiedString = modifiedString [ : i ] + modifiedString [ i + 1 : ]
	if len ( pattern ) != len ( modifiedString ) :
		return False
	for i in range ( len ( pattern ) ) :
		if pattern [ i ] != modifiedString [ i ] :
			return False
	return True
if __name__ == " _ _ main _ _ " :
	string = " engineers ▁ rock "
	pattern = " er "
	print ( " Expected : ▁ true , ▁ Actual : " , followsPattern ( string , pattern ) )
	string = " engineers ▁ rock "
	pattern = " egr "
	print ( " Expected : ▁ false , ▁ Actual : " , followsPattern ( string , pattern ) )
	string = " engineers ▁ rock "
	pattern = " gsr "
	print ( " Expected : ▁ false , ▁ Actual : " , followsPattern ( string , pattern ) )
	string = " engineers ▁ rock "
	pattern = " eger "
	print ( " Expected : ▁ true , ▁ Actual : " , followsPattern ( string , pattern ) )