Regex index

Supported in: Batch, Faster, Streaming

Returns an array of indices (counted as Unicode code points) at which the regular expression pattern is found in the given expression.

Expression categories: Regex, String

Declared arguments

• Expression: The expression to match against the regular expression.
  Expression<String>
• Regex: The regular expression to find indices for.
  Expression<String>

Output type: Array<Integer>

Examples

Example 1: Base case

Description: You can find regex patterns and their indices.

Argument values:

• Expression: ababab
• Regex: ab

Output: [ 0, 2, 4 ]

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Example 2: Base case

Description: Overlapping matches are not considered separately; the entire matching segment is treated as a single match.

Argument values:

• Expression: abcdcef
• Regex: .c.

Output: [ 0 ]

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Example 3: Base case

Description: Regex patterns sometimes don't match input strings, resulting in an empty array.

Argument values:

• Expression: abdefg
• Regex: cd

Output: [ ]

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Example 4: Base case

Argument values:

• Expression: string
• Regex: pattern

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Example 5: Null case

Argument values:

• Expression: string
• Regex: pattern

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Example 6: Null case

Description: If the expression is null, the output is null.

Argument values:

• Expression: null
• Regex: ab

Output: null

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Example 7: Null case

Description: If the pattern is null, the output is null.

Argument values:

• Expression: ababab
• Regex: null

Output: null

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Example 8: Null case

Argument values:

• Expression: string
• Regex: pattern

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