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`string.indexOfRegex()`

Get the index of the first substring matching a provided regular expression within a String.

Signature

indexOfRegex(regex: String) => Number | Null

indexOfRegex(regex: String, start: Number) => Number | Null

Description

Returns the zero-based offset index for the first occurrence of a substring matching a provided regular expression within the calling String. Starts at an optional start position in the calling String. == Parameters

Parameter Type Required Description

Parameter	Type	Required	Description
regex	String	true	Regular expression used to match substrings in the calling String. Supports Java regex.
start	Number		Zero-based index of the character to start searching for matches. Defaults to `0`.

regex

String

true

Regular expression used to match substrings in the calling String. Supports Java regex.

start

Number

Zero-based index of the character to start searching for matches. Defaults to 0.

Return value

Type	Description
Int	Zero-based index of the first matching occurrence in the calling String.
Null	No match not found.

Type

Description

Int

Zero-based index of the first matching occurrence in the calling String.

Null

No match not found.

Examples

'foo 123'.indexOfRegex('[0-9]')

'foo 123 abc 5678'.indexOfRegex('[0-9]', 10)

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