12.Wechall-------------Training: Regex by Gizmore（3级）（得分2个）
0x01：题目
| 题目 | 题目地址链接 |
|---|---|
| Regex (level 3) | http://www.wechall.net/challenge/training/regex/index.php |
0x02：WR
| 提示1 | 提示2 | 提示3 | 解题步骤 |
|---|---|---|---|
| Ok, matching static strings is not the main goal of regular expressions.Your next task is to submit an expression that matches valid filenames for certain images. | Your pattern shall match all images with the name wechall.ext or wechall4.ext and a valid image extension.Valid image extensions are .jpg, .gif, .tiff, .bmp and .png. | Here are some examples for valid filenames: wechall4.tiff, wechall.png, wechall4.jpg, wechall.bmp | /^wechall4?.(?:jpg |
0x03：passwd/flag
/^wechall4?.(?:jpg|gif|tiff|bmp|png)$/