LEX

1)Write a lex program to check whether a given number is even or odd. 2)Write a lex program to check whether a given email id is valid or not. 3)Write a lex program to check whether a given mobile number is valid or not. 4)Write a lex program to check whether a given input is digit or not. 5)Write a lex program to accept a string starting with vowel. 6)Write a lex program to count the number of letters and numbers in a given string. 7)write a lex program to count the number of vowels and consonants in a given string. 8)Write a lex program to count the number of lines,spaces,tabs and characters. 9)Write a lex program to count number of words. 10)Write a lex program to find the length of a string. 11)Write a lex program to find the size of a word. 12)Write a lex program to recognize keyword,identifier,number,operator,separator. 13)Write a lex program to count the number of positive and negative numbers 14)Write a lex program to count the total number of tokens 15)Write a lex program to c...