删除除特定字符串序列之外的所有字符串

function removeNonSpecificStrings(inputString, specificString) {
  let result = '';
  for (let i = 0; i < inputString.length; i++) {
    if (specificString.includes(inputString[i])) {
      result += inputString[i];
    }
  }
  return result;
}

const input = "abcdefg";
const specific = "abc";
const output = removeNonSpecificStrings(input, specific);
console.log(output); // 输出：abc

def remove_non_specific_strings(input_string, specific_string):
    result = ''
    for char in input_string:
        if char in specific_string:
            result += char
    return result

input = "abcdefg"
specific = "abc"
output = remove_non_specific_strings(input, specific)
print(output)  # 输出：abc

SELECT REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(
    input_string, 'a', ''), 'b', ''), 'c', ''), 'd', ''), 'e', ''), 'f', ''), 'g', ''), 'h', ''), 'i', ''), 'j', '')
FROM table_name;

#!/bin/bash

input="abcdefg"
specific="abc"
output=$(echo "$input" | tr -cd "$specific")
echo "$output"  # 输出：abc