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# regex_match

Tests whether an input string matches a regular expression. The full string must match the regular expression, otherwise the function returns `nil`. To find matches within a string, OpenText recommends using the function regex_search.

## Syntax

    regex_match( input, regex [, case] )

## Arguments

Argument | Description
--- | ---
`input` | (string) The input string.
`regex` | (string) The regular expression to match against.
`case` | (boolean) A boolean that specifies whether the match is case-sensitive. The match is case sensitive by default (`true`).

## Returns

One or more strings, or `nil`.

If the string matches the regular expression, and the regular expression has no sub-matches, the full string is returned.

If the string matches the regular expression, and the regular expression has sub-matches, then only the sub-matches are returned.

If the string does not match the regular expression, there are no return values (any results are `nil`).

You can assign multiple strings to a table. To assign the return values to a table, surround the function call with braces. For example:

    matches = { regex_match( input, regex ) }

## Examples

    local r1, r2, r3 = regex_match( "abracadabra", "(a.r)((?:a.)*ra)" )

Results: `r1="abr"`, `r2="acadabra"`, `r3=nil`

    local r1, r2, r3 = regex_match( "abracadabra", "a.r(?:a.)*ra" )

Results: `r1="abracadabra"`, `r2=nil`, `r3=nil`

Copyright 2025 Open Text
Version 25.2 | Last updated April 2025

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Product: Knowledge Discovery Web Connector 25.2

Topic Title: regex_match