_Added in 1.9.0_

*$regsubex([name], text, re, subtext, [%var|&binvar])*

Performs a regular [[Scripting_Regex|regular expression]] and then performs a substitution using subtext.

Returns the substituted text.

_See also [[$regex]], [[$regsub]], [[$regml]], [[$regmlex]]. [[$regerrstr]]._

*Parameters*

table(ktable).
|*Parameter*|*Description*|
| [name] | Name of the search, which can later be referenced using [[$regml]]. (optional) |
| text | The text to search. |
| re | The [[Scripting_Regex<notextile>|</notextile>regular expression]] to perform. |
| subtext | Subtext to replace with. |
| [%var<notextile>|</notextile>&binvar] | Optionally output the text to a %var or a &binvar. ([name] must be defined and returns the number of matches instead of the substituted text) |

*Subtext*

table(ktable).
|*Character*|*Description*|
| \0 | Returns the number of matches. |
| \n | Returns the current match number. |
| \t | Returns the current match text (same as [[$regml]](\n)). |
| \a | Returns all matching items. |
| \A | Returns a non-spaced version of \a. |
| \@ | Returns the total number of matches. *(AdiIRC only)* |
| \1 \2 \N ... | Returns the Nth back-reference made for a given match |

The subtext evaluates identifiers before performing the substitution and special markers can be used to reference various parts of the result.

*Example*

<pre>
; Find all lowercase 'a-z' characters and replace them with an uppercase character.
//echo -ag $regsubex(abcdefg,/([a-z])/g,$upper(\1))
</pre>