如何检查字符串中的某个字符是否在另一个字符之后？

Question

Given a string aaabbbcccooeellmmzzz how can I count the number of characters that comes after 'm'. For example in this case it should return 5 (ie oozzz);

Note: Here o and z characters come after 'm' in alphabetical order not about their index position after m.

So i want to count the characters (n,o,p,q,r,s,t,u,v,w,x,y,z) as many times they appear in the string.

Sample Input: aaabbbcccooeellmmmzzz
Sample Output: 5

Answer 1

Use substring to remove everything from the start to the index of the last occurrence of the character, then get the length:

 let character = 'm'; let str = 'aaabbbcccooeellmmmzzz'; let res = str.substring(str.lastIndexOf(character) + 1).length; console.log(res)