模板:Str mid/doc

此頁面是Template:Str mid的模板文件文檔。
此頁面可能包含了模板的使用說明、分類和其他內容。

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Usage

Characters in the source string are counted: the first is index {{{2}}}, the last one is index {{{2}}}. 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

Counting from the end

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

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

Instead if substring length, use index for last character

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

Spaces are kept

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<

Error messages

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

{{str mid|Abcdefghijklmnopqrstuvwxyz|30}} → String模塊錯誤：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

Error category

|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.

Default is Category:Errors reported by Module String.