58 lines
1.2 KiB
Markdown
58 lines
1.2 KiB
Markdown
---
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title: regexp.findStringIndex() function
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description: >
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The `regexp.findStringIndex()` function returns a two-element array of integers defining
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the beginning and ending indexes of the left-most regular expression match in a string.
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menu:
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v2_0_ref:
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name: regexp.findStringIndex
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parent: Regular expressions
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weight: 301
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related:
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- /v2.0/reference/flux/functions/regexp/compile
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---
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The `regexp.findStringIndex()` function returns a two-element array of integers defining
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the beginning and ending indexes of the left-most regular expression match in a string.
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_**Output data type:** Array of Integers_
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```js
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import "regexp"
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regexp.findStringIndex(r: /ab?/, v: "tablet")
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// Returns [1, 3]
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```
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## Parameters
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### r
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The regular expression used to search `v`.
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_**Data type:** Regexp_
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### v
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The string value to search.
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_**Data type:** String_
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## Examples
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###### Index the bounds of first regular expression match in each row
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```js
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import "regexp"
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data
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|> map(fn: (r) => ({
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r with
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regexStr: r.regexStr,
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_value: r._value,
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matchIndex: regexp.findStringIndex(
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r: regexp.compile(r.regexStr),
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v: r._value
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)
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})
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)
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```
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