php简单压缩英文字符串的代码

3. //replacement来自上个版本的加密替换

4. function compress_func($match) {return strlen($match[0]).$match[0]{0};}
5. function uncompress_func($match) {return str_repeat($match[2], $match[1]);}
6. function compress($str) {
7. $i = 0;
8. $pattern = array();
9. while(isset($replacement{$i})) array_push($pattern, "/".$replacement{$i++}."{2,}/");
10. return preg_replace_callback($pattern, "compress_func", $str);
11. }

12. function uncompress($str) {

13. return preg_replace_callback("/(d+)(w)/", "uncompress_func", $str);
14. }
15. ?>

下面再分享个awk实现字符串压缩的代码。 AWK,通用格式压缩字符串：

2. #!/bin/awk
3. function compress(str, _ARGVEND_, str_out, str_len, i, s, l) {
4. str_out = "";
5. str_len = length(str);
6. s = "";
7. l = 1;
8. for(i =1; i <= str_len; i++) {
9. if(substr(str, i, 1) == s) l++;
10. else {
11. if(s != "") {
12. if(l > 1) str_out=str_out""l
13. str_out=str_out""s;
14. }
15. s = substr(str, i, 1);
16. l = 1;
17. }
18. }
19. return str_out;
20. }
21. function uncompress(str, _ARGVEND_, str_out, str_len, i, c) {
22. str_out = "";
23. str_len = length(str);
24. for(i =1; i <= str_len; i++) {
25. c = 0;
26. while(substr(str, i, 1)~/[0-9]/) {
27. c = c*10+substr(str, i, 1);
28. i++;
29. }
30. if(c < 1) c = 1;
31. while(c--) str_out = str_out""substr(str, i, 1);
32. }
33. return str_out;
34. }