diff --git a/packages/mysql/src/builder.ts b/packages/mysql/src/builder.ts
index 3b3cae7a..704b48d7 100644
--- a/packages/mysql/src/builder.ts
+++ b/packages/mysql/src/builder.ts
@@ -1,11 +1,11 @@
 import { Builder, escapeId, isBracketed } from '@cordisjs/sql-utils'
 import { Binary, Dict, isNullable, Time } from 'cosmokit'
-import { bufferToUuid, Driver, Field, isAggrExpr, isEvalExpr, Model, randomId, Selection, Type, uuidToBuffer } from '@cordisjs/plugin-database'
+import { bufferToUuid, Driver, Field, isAggrExpr, isEvalExpr, Model, randomId, RegExpLike, Selection, Type, uuidToBuffer } from '@cordisjs/plugin-database'
 
 export interface Compat {
   maria?: boolean
-  maria105?: boolean
   mysql57?: boolean
+  ci?: boolean
   uuid?: boolean
   timezone?: string
 }
@@ -34,6 +34,21 @@ export class MySQLBuilder extends Builder {
     super(driver, tables)
     this._dbTimezone = compat.timezone ?? 'SYSTEM'
 
+    if (this.compat.mysql57 || this.compat.maria) {
+      this.queryOperators.$regexFor = (key, value) => typeof value === 'string' ? `${this.escape(value)} ${this.compat.ci
+        ? 'collate utf8mb4_bin' : ''} regexp ${key}` : `${this.escape(value.input)} ${(!!value.flags?.includes('i') === !!this.compat.ci)
+        ? '' : this.compat.ci ? 'collate utf8mb4_bin' : 'collate utf8mb4_general_ci'} regexp ${key}`
+      this.evalOperators.$regex = ([key, value, flags]) => `(${this.parseEval(key)} ${
+        ((!!flags?.includes('i') || (value instanceof RegExp && value.flags.includes('i'))) === !!this.compat.ci)
+          ? '' : this.compat.ci ? 'collate utf8mb4_bin' : 'collate utf8mb4_general_ci'
+      } regexp ${this.parseEval(value)})`
+    } else {
+      this.queryOperators.$regexFor = (key, value) => typeof value === 'string' ? `regexp_like(${this.escape(value)}, ${key}, 'c')`
+        : `regexp_like(${this.escape(value.input)}, ${key}, ${value.flags?.includes('i') ? `'i'` : `'c'`})`
+      this.evalOperators.$regex = ([key, value, flags]) => `regexp_like(${this.parseEval(key)}, ${this.parseEval(value)}, ${
+        (flags?.includes('i') || (value instanceof RegExp && value.flags.includes('i'))) ? `'i'` : `'c'`})`
+    }
+
     this.evalOperators.$select = (args) => {
       if (compat.maria || compat.mysql57) {
         return this.asEncoded(`json_object(${args.map(arg => this.parseEval(arg, false)).flatMap((x, i) => [`${i}`, x]).join(', ')})`, true)
@@ -143,6 +158,22 @@ export class MySQLBuilder extends Builder {
     }
   }
 
+  protected createRegExpQuery(key: string, value: string | RegExpLike) {
+    if (this.compat.mysql57) {
+      if (typeof value !== 'string' && value.flags?.includes('i')) {
+        return `${key} ${this.compat.ci ? '' : 'collate utf8mb4_general_ci'} regexp ${this.escape(value.source)}`
+      } else {
+        return `${key} ${this.compat.ci ? 'collate utf8mb4_bin' : ''} regexp ${this.escape(typeof value === 'string' ? value : value.source)}`
+      }
+    } else {
+      if (typeof value !== 'string' && value.flags?.includes('i')) {
+        return `${key} regexp ${this.escape('(?i)' + value.source)}`
+      } else {
+        return `${key} regexp ${this.escape('(?-i)' + (typeof value === 'string' ? value : value.source))}`
+      }
+    }
+  }
+
   protected createMemberQuery(key: string, value: any, notStr = '') {
     if (Array.isArray(value) && Array.isArray(value[0]) && (this.compat.maria || this.compat.mysql57)) {
       const vals = `json_array(${value.map((val: any[]) => `(${this.evalOperators.$select!(val)})`).join(', ')})`
diff --git a/packages/mysql/src/index.ts b/packages/mysql/src/index.ts
index 63dda6b7..61d5c3d2 100644
--- a/packages/mysql/src/index.ts
+++ b/packages/mysql/src/index.ts
@@ -76,8 +76,6 @@ export class MySQLDriver extends Driver<MySQLDriver.Config> {
     const [version, timezone] = Object.values((await this.query(`SELECT version(), @@GLOBAL.time_zone`))[0]) as string[]
     // https://jira.mariadb.org/browse/MDEV-30623
     this._compat.maria = version.includes('MariaDB')
-    // https://jira.mariadb.org/browse/MDEV-26506
-    this._compat.maria105 = !!version.match(/10.5.\d+-MariaDB/)
     // For json_table
     this._compat.mysql57 = !!version.match(/5.7.\d+/)
     // MariaDB 10.7+ has the native UUID data type
@@ -89,6 +87,7 @@ export class MySQLDriver extends Driver<MySQLDriver.Config> {
       this._compat.uuid = major > 10 || (major === 10 && minor >= 7)
     }
 
+    this._compat.ci = this.config.charset?.toLowerCase().endsWith('ci')
     this._compat.timezone = timezone
 
     this.sql = new MySQLBuilder(this, undefined, this._compat)
@@ -641,6 +640,7 @@ export namespace MySQLDriver {
       user: z.string().default('root'),
       password: z.string().role('secret'),
       database: z.string().required(),
+      charset: z.string().default('utf8mb4_general_ci'),
     }),
     z.object({
       ssl: z.union([
diff --git a/packages/postgres/src/builder.ts b/packages/postgres/src/builder.ts
index ed897a05..d81ee9a3 100644
--- a/packages/postgres/src/builder.ts
+++ b/packages/postgres/src/builder.ts
@@ -32,7 +32,6 @@ export class PostgresBuilder extends Builder {
 
     this.queryOperators = {
       ...this.queryOperators,
-      $regex: (key, value) => this.createRegExpQuery(key, value),
       $regexFor: (key, value) => typeof value === 'string' ? `${this.escape(value)} ~ ${key}`
         : `${this.escape(value.input)} ${value.flags?.includes('i') ? '~*' : '~'} ${key}`,
       $size: (key, value) => {
diff --git a/packages/sql-utils/src/index.ts b/packages/sql-utils/src/index.ts
index 5fde4209..a3656f11 100644
--- a/packages/sql-utils/src/index.ts
+++ b/packages/sql-utils/src/index.ts
@@ -59,7 +59,7 @@ interface State {
   wrappedSubquery?: boolean
 }
 
-export class Builder {
+export abstract class Builder {
   protected escapeMap = {}
   protected escapeRegExp?: RegExp
   protected createEqualQuery = this.comparator('=')
@@ -97,8 +97,6 @@ export class Builder {
 
       // regexp
       $regex: (key, value) => this.createRegExpQuery(key, value),
-      $regexFor: (key, value) => typeof value === 'string' ? `${this.escape(value)} collate utf8mb4_bin regexp ${key}`
-        : `${this.escape(value.input)} ${value.flags?.includes('i') ? 'regexp' : 'collate utf8mb4_bin regexp'} ${key}`,
 
       // bitwise
       $bitsAllSet: (key, value) => `${key} & ${this.escape(value)} = ${this.escape(value)}`,
@@ -152,9 +150,6 @@ export class Builder {
 
       // string
       $concat: (args) => `concat(${args.map(arg => this.parseEval(arg)).join(', ')})`,
-      $regex: ([key, value, flags]) => `(${this.parseEval(key)} ${
-        (flags?.includes('i') || (value instanceof RegExp && value.flags.includes('i'))) ? 'regexp' : 'collate utf8mb4_bin regexp'
-      } ${this.parseEval(value)})`,
 
       // logical / bitwise
       $or: (args) => {
@@ -230,13 +225,7 @@ export class Builder {
     }
   }
 
-  protected createRegExpQuery(key: string, value: string | RegExpLike) {
-    if (typeof value !== 'string' && value.flags?.includes('i')) {
-      return `${key} regexp ${this.escape(value.source)}`
-    } else {
-      return `${key} collate utf8mb4_bin regexp ${this.escape(typeof value === 'string' ? value : value.source)}`
-    }
-  }
+  protected abstract createRegExpQuery(key: string, value: string | RegExpLike): string
 
   protected listContains(list: any, value: string) {
     return `find_in_set(${value}, ${list})`