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In this article
Applies to: ✅ Azure Data Explorer ✅ Azure Monitor ✅ Microsoft Sentinel
Returns the zero-based index of the first occurrence of a specified lookup regular expression within the input string.
See indexof()
.
indexof_regex(
string,
match[,
start[,
length[,
occurrence]]])
Learn more about syntax conventions.
Name | Type | Required | Description |
---|---|---|---|
string | string |
✔️ | The source string to search. |
match | string |
✔️ | The regular expression lookup string. |
start | int |
The search start position. A negative value will offset the starting search position from the end of the string by this many steps: abs( start) . |
|
length | int |
The number of character positions to examine. A value of -1 means unlimited length. | |
occurrence | int |
The number of the occurrence. The default is 1. |
The zero-based index position of match.
- Returns -1 if match isn't found in string.
- Returns
null
if:- start is less than 0.
- occurrence is less than 0.
- length is less than -1.
Note
- Overlapping matches lookup aren't supported.
- Regular expression strings may contain characters that require either escaping or using @'' string-literals.
print
idx1 = indexof_regex("abcabc", @"a.c"), // lookup found in input string
idx2 = indexof_regex("abcabcdefg", @"a.c", 0, 9, 2), // lookup found in input string
idx3 = indexof_regex("abcabc", @"a.c", 1, -1, 2), // there's no second occurrence in the search range
idx4 = indexof_regex("ababaa", @"a.a", 0, -1, 2), // Matches don't overlap so full lookup can't be found
idx5 = indexof_regex("abcabc", @"a|ab", -1) // invalid start argument
Output
idx1 | idx2 | idx3 | idx4 | idx5 |
---|---|---|---|---|
0 | 3 | -1 | -1 |