---
title: Read filter syntax
slug: '2727'
canonical_url: https://docs.coveo.com/en/2727/
collection: coveo-analytics
source_format: adoc
---
# Read filter syntax
The following table details the syntax to use when filling out [filter](https://docs.coveo.com/en/2736/) parameters (that is, `f` and `fm`) in [Coveo Analytics](https://docs.coveo.com/en/182/) Read API requests.

[cols="~,~,~"]
|===
| Symbol | Operation | Example

| `=~`
| Equals (case insensitive)
| `originlevel1 =~ "agentcasepanel"`

| `!~`
| Not equal (case insensitive)
| `originlevel1 !~ "agentcasepanel"`

| `==`
| Equals (case sensitive)
| `originlevel1 == "AgentCasePanel"`

| `!=`
| Not equal (case sensitive)
| `originlevel1 != "AgentCasePanel"`

| `=@`
| Contains (case insensitive)
| `originlevel1 =@ "Agent"`

| `!@`
| Does not contain (case insensitive)
| `originlevel1 !@ "Agent"`

| `<`
| Less than
| `PerformSearch < 100`

| `+<=+`
| Less than or equal to
| `+PerformSearch <= 100+`

| `>`
| Greater than
| `PerformSearch > 100`

| `>=`
| Greater than or equal to
| `PerformSearch >= 100`

| `IN`
| In array (case sensitive)
| `originlevel1 IN ["AgentCasePanel","InsightPanel"]`

| `NOT_IN`
| Not in array (case sensitive)
| `originlevel1 NOT_IN ["AgentCasePanel","InsightPanel"]`

| `AND`
| Logical AND
| `(groupname!=null) AND (originlevel1 IN ["AgentCasePanel","InsightPanel"])`

| `OR`
| Logical OR
| `(groupname!=null) OR (originlevel1 IN ["AgentCasePanel","InsightPanel"])`
|===

> **Notes**
>
> * `AND` applies by default when you send several `f` or `fm` parameters.
>  
> For example, appending `&f=groupname!=null&f= originlevel1 IN ["AgentCasePanel","InsightPanel"]` to your [query](https://docs.coveo.com/en/231/) string is equal to appending `&f=(groupname!=null) AND ([origin level 1](https://docs.coveo.com/en/1337/) IN ["AgentCasePanel","InsightPanel"])` to your query string.
> 
> * You can use either single (for example, `'Agent'`) or double (for example, `"Agent"`) quotes to delimit strings.
> 
> * To escape a quote in a string, use `\`.