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Operators - mIRC
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By now, you should have a pretty good idea of what variables are and how to use them. Now, all you need to be able to do is operate on them. That's exactly what mIRC Operators lets you do. Operators are special symbols or keywords that perform specific operations on two or three operands in mIRC.

Operators

mIRC provides the following types of operators:

  • Arithmetic Operators
  • Math Comparison Operators
  • String Comparison Operators
  • Lexicographical String Comparison Operators
  • Logical Operators
  • Channel-related Operators
  • List-related Operators

Arithmetic Operators

mIRC supports the following arithmetic operators:

Operator Syntax
Addition a + b
Subtraction a - b
Multiplication a * b
Division a / b
Modulo a % b
Power a ^ b

They can be used in conjunction with the /var or /set commands as well as using the $calc Identifier. One special feature of the $calc identifier over the /var and /set commands is that it supports combination of operators as well as parenthesis to be able to change the order of operations. 

alias example {
  var %x = 5
  ;5 * 5 = 25
  %x = %x * 5
  echo -a %x
 
  ;remainder of 25 / 9 = 7
  var %y = %x % 9
  echo -a %y
 
  ;25 + 7 - 2 = 30
  %x = $calc(%x + %y - 2)
  echo -a %x
}

Math Comparison Operators

Math Comparison operators allow you to compare two values:

Syntax Name Result
%x == %y Equal True, if %x is equal to %y.
%x != %y Not equal True, if %x is not equal to %y.
%x < %y Less than True, if %x is strictly less than %y.
%x > %y Greater than True, if %x is strictly greater than %y.
%x <= %y Less than or equal to True, if %x is less than or equal to %y.
%x >= %y Greater than or equal to True, if %x is greater than or equal to %y.
%x // %y Multiple Of (Divides) True, if %x divides %y.
%x \\ %y Not Multiple Of (Not Divides) True, if %x does not divides %y.
%x & %y Bitwise And True, if (bit representation of) %x AND %y is a none zero.

Example: 

alias example2 {
  ;true (3 a multiple of 9)
  if (3 // 9) echo yes!
  ;false
  if (4 < 4) echo no
  ;00001010 = 10
  ;00000100 = 4
  ;00000000 = 0
  ;true, we used the '!' to negate the operator
  if (10 !& 4) echo yes
}

String Comparison Operators

mIRC provides a set of operators that can be used to compare two strings. The two iswm and iswmcs operators support two wildcard characters as well, the question mark (?) substitutes for any one character and the asterisk character ("*") substitutes for any zero or more characters.

Syntax Name Result
%x isin %y Is In True, if %x is fully found inside %y.
%x isincs %y Is In (case sensitive) True, if %x is fully found inside (case sensitive) %y.
%x iswm %y Wildcard Matching True, if wildcard string %x matches %y.
%x iswmcs %y Wildcard Matching (case sensitive) True, if wildcard string %x matches (case sensitive) %y.
%x isnum
%x isnum N
%x isnum N-
%x isnum N-M
 Is Digit
Is Digit, Equal to
Is Digit, Greater than or equal to
Is Digit, in Range 		True, if %x is a number
True, if %x is number N
True, if %x is number N or greater
True, if %x is a number between N and M (inclusively)
%x isletter
%x isletter N
 Is a Letter
Is a Letter In A List
 True, if %x is a letter
True, if %x is a letter in a list of letters
%x isalnum Alphanumeric Characters True, if %x contains only alphabetic or numeric characters.
%x isalpha Alphabetic Characters True, if %x contains only alphabetic characters.
%x islower All lower case letters True, if %x contains only lower case letters.
%x isupper All upper case letters True, if %x contains only upper case letters.

Example: 

alias example3 {
  var %x = Hello!
  if (?ell?? iswm %x) echo true
  ;false, because of '!'
  if (%x isalpha) echo no
  %x = 5
  if (%x isnum 1-10) echo true
  if (%x isnum)  echo true
}

Lexicographical String Comparison Operators

A lexicographical comparison is a comparison generally used to sort words alphabetically in dictionaries and indexes. If both strings are equal but one is shorter than the other, the shorter string is lexicographically less than the longer one.

Syntax Name Result
a == b Case insensitive character comparison True, if character a is equal to character b, case insensitive.
a === b Case sensitive character comparison True, if character a is equal to character b, case sensitive.
str1 == str2 Case insensitive String comparison True, if str1 equals str2 in a case insensitive manner.
str1 === str2 Case sensitive String comparison True, if str1 equals str2 in a case sensitive manner.
a < b Lexicographically Less Than True, if the $asc(a) comes before $asc(b)
a > b Lexicographically Greater Than True, if the $asc(a) comes after $asc(b)
str1 < str2 Lexicographically Less Than True, if str1 comes before str2
str1 > str2 Lexicographically Greater Than True, if str1 comes after str2

Logical Operators

In an if statement, you are allowed to have more than one condition. Each condition has to be connected to the other using a logical operator. There are two logical operators: || meaning OR and && meaning AND.

Example: 

if ((%x < 0) || (%x >  10)) {

In the if statement above, %x has to be less than 0 OR greater than 10 to make the if statement be true. 

if ((%input isupper) && ($len(%input) < 10)) {

The if statement above will only be true if %a contains only upper case letters and its total length is less than 10.

Short-circuit evaluation

mIRC will only evaluate as much of the condition has it needs. Consider the AND example from above, if %input doesn't contain only upper case letters, the second condition will never even evaluate. This is important to keep in mind when using custom identifiers inside an if statement.


Channel-related Operators

mIRC also provides a set of commands to involve IRC channels:

Syntax Name Result
%x ison %y Is On True, if nick %x is on channel %y.
%x isop %y Is an Operator True, if nick %x is an operators on channel %y.
%x ishop %y Is a Halfop True, if nick %x is a halfop on channel %y.
%x isvoice %y Is a Voice True, if nick %x is a voice on channel %y.
%x isreg %y Is a Regular True, if nick %x is a regular user on channel %y.
%x ischan Is a Channel True, if channel %x is a channel you are on.
%x isban %y Is a ban True, if ban address %x is a ban on channel %y. (taken from IBL)
%x isquiet %y Is a quiet ban True, if ban address %x is a quiet ban on channel %y. (taken from IQL)

Example: 

alias example4 {
  ;am I on #mIRC
  if (#mIRC ischan) echo yes
  ;is that ban on #mSL's internal ban list?
  if (*!*@example.com isban #offTopic) echo yes
  ;am I an OP on #mIRC?
  if ($me isop #mIRC) echo yes
}

List-related Operators

mIRC has 5 additional operators to check mIRC internal lists:

Syntax Name Result
%x isaop
%x isaop %y 		In Auto-Op List
In Auto-Op List For Chan 		True, if host %x is in the auto-op list.
True, if host %x is in the auto-op list for channel %y.
%x isavoice
%x isavoice %y 		In Auto-Voice List
In Auto-Voice List For Chan 		True, if host %x is in the auto-voice list.
True, if host %x is in the auto-voice list for channel %y.
%x isignore
%x isignore %y 		In Ignore List
In Ignore List For Type 		True, if host %x is in the ignore list.
True, if host %x is in the ignore list for type %y.
%x isprotect
%x isprotect %y 		In Protect List
In Protect List For Chan 		True, if host %x is in the protect list.
True, if host %x is in the protect list for channel %y.
%x isnotify In Notify List True, if host %x is in the notify list.

Example: 

Alias example5 {
  ;is the host in the auto-op list
  if (dave101!*@* isaop) echo yes
 
  ;assume we have ignore all ctcps: /ignore -tw *!*@*
  ;check if *!*@* in the ignore list for CTCPs:
  if (*!*@* isignore ctcp) echo yes
}
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