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# Bản mẫu:Str mid

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## Cách sử dụng

Characters in the source string are counted: the first is index `1`, the last one is index `length of string`. The substring requested can be defined by these two indexes. Also, the substring can be defined by one index, and the substring length. The options are: {{str mid|<string>|<index of first character>|<length of substring>|<index of last character>}} It returns a part of the <string>, starting with character on position index, length <sublength>, last character returned is end index.

• {{str mid|Abcdefghijklmnopqrstuvwxyz|5|3}} → efg

If parameter 2 is omitted, start is from character 1:

• {{str mid|Abcdefghijklmnopqrstuvwxyz||5}} → Abcde

If parameter 3 is omitted, the whole rest of the string is returned:

• {{str mid|Abcdefghijklmnopqrstuvwxyz|15}} → opqrstuvwxyz

### Tính từ cuối cùng

By entering a negative value, the index is counted from the end:

• {{str mid|Abcdefghijklmnopqrstuvwxyz|-7|4}} → tuvw
• {{str mid|Abcdefghijklmnopqrstuvwxyz|-7}} → tuvwxyz

### Thay vào đó nếu độ dài chuỗi con, sử dụng chỉ số cho ký tự cuối cùng

By using parameter `|4=n`, a number, you do not ask for substring length, but the last character (as counted from the start of the input string):

• {{str mid|Abcdefghijklmnopqrstuvwxyz|5||7}} → efg

### Khoảng cách được giữ lại

In the returned substring, spaces are kept:

• >{{str mid|I like this.|2|6}}< → >like<

But the input string is trimmed:

• >{{str mid| I like this. |2|6}}< → >like<

### Thông báo lỗi

When the ranges (either param2 or the substring length) is out impossible in the string, an error is returned:

• {{str mid|Abcdefghijklmnopqrstuvwxyz|30}} → String Module Error: String subset index out of range
• {{str mid|Abcdefghijklmnopqrstuvwxyz|0|45}} → efghijklmnopqrstuvwxyz

The error can be suppressed by using `|ignore errors=true`. A blank (empty string) will be returned:

• {{str mid|Abcdefghijklmnopqrstuvwxyz|0|45|ignore errors=true}} → efghijklmnopqrstuvwxyz

#### Thể loại lỗi

• `|no category=true` switches off category adding.
• `|error category=[[Category:Your category name]]` sets the category to be added when in case of an error.
Mặc định là Thể loại:Trang gây lỗi trong mô đun String.