Description:
Get the position of a substring in its parent string.
Syntax:
pos(s1, s2{, begin})
Note:
The function finds the position of substring s2 in the parent string s1, which starts from the position begin, and returns null if the substring cannot be found.
Parameter:
|
s1 |
The parent string where you want to search for a substring |
|
s2 |
Substring of interest |
|
begin |
The position from which the search starts; the default search is from the beginning |
Option:
|
@z |
Perform the search leftward starting from begin, while the search will be done rightward by default |
|
@c |
Case-insensitive |
|
@h |
Search for the substring at the beginning of the parent string by ignoring parameter begin |
|
@q |
Skip quoted strings when searching the parent string |
|
@w |
Only locate a same and whole substring |
Return value:
Integer type
Example:
|
pos("abcdef","def") |
4 |
|
pos("abcdefdef","def",5) |
7 |
|
pos("abcdef","defa") |
(null) |
|
pos@z("abcdeffdef","def",7) |
4 |
|
pos("abcdeffdef","def",7) |
8 |
|
pos@c("abcdef","Def") |
4; @c option makes case-insensitive. |
|
pos ("a'b'cbe","b") |
3 |
|
pos@q("a'b'cbe","b") |
6; use @q option to skip quoted strings. |
|
pos("aab,aa","aa") |
1 |
|
pos@w("aab,aa","aa") |
5; use @w option to locate the same and whole substring only. |
|
pos@h("abcdef","abc",3) |
1; use @h option to match the parent string from the beginning. That is, ignore parameter begin and search for the substring from the 1st character of parameter s1. |