diff --git a/src/main/kotlin/icu/windea/pls/core/StdlibExtensions.kt b/src/main/kotlin/icu/windea/pls/core/StdlibExtensions.kt
index b81ea064c..47966c4f9 100644
--- a/src/main/kotlin/icu/windea/pls/core/StdlibExtensions.kt
+++ b/src/main/kotlin/icu/windea/pls/core/StdlibExtensions.kt
@@ -355,33 +355,6 @@ fun String.toCapitalizedWords(): String {
 
 private val keywordDelimiters = charArrayOf('.', '_')
 
-/**
- * 判断指定的关键词是否匹配当前字符串。
- */
-@Suppress("PLATFORM_CLASS_MAPPED_TO_KOTLIN")
-fun String.matchesKeyword(keyword: String): Boolean {
-    if(keyword.isEmpty()) return true
-    
-    //IDEA底层如何匹配关键词：
-    //com.intellij.codeInsight.completion.PrefixMatcher.prefixMatches(java.lang.String)
-    
-    //这里如何匹配关键词：按顺序包含所有字符，忽略大小写
-    var index = -1
-    for(i in 0 until keyword.length) {
-        val c = keyword[i]
-        val index1 = (this as java.lang.String).indexOf(c.lowercaseChar().code, index + 1)
-        val index2 = (this as java.lang.String).indexOf(c.uppercaseChar().code, index + 1)
-        when {
-            index1 == -1 && index2 == -1 -> return false
-            index1 == -1 -> index = index2
-            index2 == -1 -> index = index1
-            else -> index = min(index, index2)
-        }
-    }
-    
-    return true
-}
-
 fun CharSequence.indicesOf(char: Char, startIndex: Int = 0, ignoreCase: Boolean = false): List<Int> {
     var indices: MutableList<Int>? = null
     var lastIndex = indexOf(char, startIndex, ignoreCase)
diff --git a/src/main/kotlin/icu/windea/pls/core/codeInsight/completion/LimitedCompletionProcessor.kt b/src/main/kotlin/icu/windea/pls/core/codeInsight/completion/LimitedCompletionProcessor.kt
index 7dc89ce0b..5f85f8513 100644
--- a/src/main/kotlin/icu/windea/pls/core/codeInsight/completion/LimitedCompletionProcessor.kt
+++ b/src/main/kotlin/icu/windea/pls/core/codeInsight/completion/LimitedCompletionProcessor.kt
@@ -4,13 +4,15 @@ import com.intellij.openapi.util.registry.*
 import com.intellij.util.*
 
 /**
+ * 进行代码提示时，确保加入的提示项不超过`ide.completion.variant.limit`指定的上限。
+ * 
  * 用于优化代码提示的性能。
  */
 class LimitedCompletionProcessor<T>(
     private val processor: Processor<T>
 ): Processor<T> {
     private val limit: Int = Registry.intValue("ide.completion.variant.limit")
-    private var count = 0
+    @Volatile private var count = 0
     
     override fun process(e: T): Boolean {
         if(!processor.process(e)) return false
diff --git a/src/main/kotlin/icu/windea/pls/core/search/ParadoxLocalisationSearch.kt b/src/main/kotlin/icu/windea/pls/core/search/ParadoxLocalisationSearch.kt
index 2fdd57309..39b7dca96 100644
--- a/src/main/kotlin/icu/windea/pls/core/search/ParadoxLocalisationSearch.kt
+++ b/src/main/kotlin/icu/windea/pls/core/search/ParadoxLocalisationSearch.kt
@@ -1,5 +1,6 @@
 package icu.windea.pls.core.search
 
+import com.intellij.codeInsight.completion.PrefixMatcher
 import com.intellij.openapi.extensions.*
 import com.intellij.psi.search.searches.*
 import com.intellij.util.*
@@ -46,13 +47,11 @@ class ParadoxLocalisationSearch : ExtensibleQueryFactory<ParadoxLocalisationProp
         }
         
         /**
-         * 基于本地化名字索引，根据关键字和推断的语言区域遍历所有的本地化（localisation），并按照本地化的键进行去重。
-         * 
          * 用于优化代码提示的性能。
          */
         @JvmStatic
         fun processVariants(
-            keyword: String,
+            prefixMatcher: PrefixMatcher,
             selector: ChainedParadoxSelector<ParadoxLocalisationProperty>,
             processor: Processor<ParadoxLocalisationProperty>
         ): Boolean {
@@ -61,7 +60,7 @@ class ParadoxLocalisationSearch : ExtensibleQueryFactory<ParadoxLocalisationProp
             val scope = selector.scope
             return ParadoxLocalisationNameIndexKey.processFirstElementByKeys(
                 project, scope,
-                keyPredicate = { key -> key.matchesKeyword(keyword) },
+                keyPredicate = { key -> prefixMatcher.prefixMatches(key) },
                 predicate = { element -> selector.select(element) },
                 getDefaultValue = { selector.defaultValue() },
                 resetDefaultValue = { selector.resetDefaultValue() },
diff --git a/src/main/kotlin/icu/windea/pls/core/search/ParadoxSyncedLocalisationSearch.kt b/src/main/kotlin/icu/windea/pls/core/search/ParadoxSyncedLocalisationSearch.kt
index bcc85d616..961d05a42 100644
--- a/src/main/kotlin/icu/windea/pls/core/search/ParadoxSyncedLocalisationSearch.kt
+++ b/src/main/kotlin/icu/windea/pls/core/search/ParadoxSyncedLocalisationSearch.kt
@@ -1,5 +1,6 @@
 package icu.windea.pls.core.search
 
+import com.intellij.codeInsight.completion.*
 import com.intellij.openapi.extensions.*
 import com.intellij.psi.search.searches.*
 import com.intellij.util.*
@@ -46,13 +47,11 @@ class ParadoxSyncedLocalisationSearch : ExtensibleQueryFactory<ParadoxLocalisati
         }
         
         /**
-         * 基于同步本地化名字索引，根据关键字和推断的语言区域遍历所有的同步本地化（localisation_synced），并按照本地化的键进行去重。
-         *
          * 用于优化代码提示的性能。
          */
         @JvmStatic
         fun processVariants(
-            keyword: String,
+            prefixMatcher: PrefixMatcher,
             selector: ChainedParadoxSelector<ParadoxLocalisationProperty>,
             processor: Processor<ParadoxLocalisationProperty>
         ): Boolean {
@@ -61,8 +60,8 @@ class ParadoxSyncedLocalisationSearch : ExtensibleQueryFactory<ParadoxLocalisati
             val scope = selector.scope
             return ParadoxSyncedLocalisationNameIndexKey.processFirstElementByKeys(
                 project, scope,
+                keyPredicate = { key -> prefixMatcher.prefixMatches(key) },
                 predicate = { element -> selector.select(element) },
-                keyPredicate = { key -> key.matchesKeyword(keyword) },
                 getDefaultValue = { selector.defaultValue() },
                 resetDefaultValue = { selector.resetDefaultValue() },
                 processor = { processor.process(it) }
diff --git a/src/main/kotlin/icu/windea/pls/lang/expression/impl/ParadoxScriptExpressionSupports.kt b/src/main/kotlin/icu/windea/pls/lang/expression/impl/ParadoxScriptExpressionSupports.kt
index e0c9cfee6..3cb3f84fb 100644
--- a/src/main/kotlin/icu/windea/pls/lang/expression/impl/ParadoxScriptExpressionSupports.kt
+++ b/src/main/kotlin/icu/windea/pls/lang/expression/impl/ParadoxScriptExpressionSupports.kt
@@ -66,7 +66,7 @@ class ParadoxScriptLocalisationExpressionSupport : ParadoxScriptExpressionSuppor
         val selector = localisationSelector(project, contextElement).contextSensitive()
             .preferLocale(ParadoxLocaleHandler.getPreferredLocale())
             //.distinctByName() //这里selector不需要指定去重
-        ParadoxLocalisationSearch.processVariants(keyword, selector, LimitedCompletionProcessor { localisation ->
+        ParadoxLocalisationSearch.processVariants(result.prefixMatcher, selector, LimitedCompletionProcessor { localisation ->
             val name = localisation.name //=localisation.paradoxLocalisationInfo?.name
             val typeFile = localisation.containingFile
             val builder = ParadoxScriptExpressionLookupElementBuilder.create(localisation, name)
@@ -121,7 +121,7 @@ class ParadoxScriptSyncedLocalisationExpressionSupport : ParadoxScriptExpression
         val tailText = ParadoxConfigHandler.getScriptExpressionTailText(config)
         //这里selector不需要指定去重
         val selector = localisationSelector(project, contextElement).contextSensitive().preferLocale(ParadoxLocaleHandler.getPreferredLocale())
-        ParadoxSyncedLocalisationSearch.processVariants(keyword, selector) { syncedLocalisation ->
+        ParadoxSyncedLocalisationSearch.processVariants(result.prefixMatcher, selector) { syncedLocalisation ->
             val name = syncedLocalisation.name //=localisation.paradoxLocalisationInfo?.name
             val typeFile = syncedLocalisation.containingFile
             val builder = ParadoxScriptExpressionLookupElementBuilder.create(syncedLocalisation, name)
@@ -180,7 +180,7 @@ class ParadoxScriptInlineLocalisationExpressionSupport : ParadoxScriptExpression
         val selector = localisationSelector(project, contextElement).contextSensitive()
             .preferLocale(ParadoxLocaleHandler.getPreferredLocale())
             //.distinctByName() //这里selector不需要指定去重
-        ParadoxLocalisationSearch.processVariants(keyword, selector, LimitedCompletionProcessor { localisation ->
+        ParadoxLocalisationSearch.processVariants(result.prefixMatcher, selector, LimitedCompletionProcessor { localisation ->
             val name = localisation.name //=localisation.paradoxLocalisationInfo?.name
             val typeFile = localisation.containingFile
             val builder = ParadoxScriptExpressionLookupElementBuilder.create(localisation, name)
diff --git a/src/main/kotlin/icu/windea/pls/localisation/codeInsight/completion/ParadoxLocalisationNameCompletionProvider.kt b/src/main/kotlin/icu/windea/pls/localisation/codeInsight/completion/ParadoxLocalisationNameCompletionProvider.kt
index ef22fba03..03d98b899 100644
--- a/src/main/kotlin/icu/windea/pls/localisation/codeInsight/completion/ParadoxLocalisationNameCompletionProvider.kt
+++ b/src/main/kotlin/icu/windea/pls/localisation/codeInsight/completion/ParadoxLocalisationNameCompletionProvider.kt
@@ -52,8 +52,8 @@ class ParadoxLocalisationNameCompletionProvider : CompletionProvider<CompletionP
             true
         }
         when(category) {
-            ParadoxLocalisationCategory.Localisation -> ParadoxLocalisationSearch.processVariants(keyword, selector, processor)
-            ParadoxLocalisationCategory.SyncedLocalisation -> ParadoxSyncedLocalisationSearch.processVariants(keyword, selector, processor)
+            ParadoxLocalisationCategory.Localisation -> ParadoxLocalisationSearch.processVariants(result.prefixMatcher, selector, processor)
+            ParadoxLocalisationCategory.SyncedLocalisation -> ParadoxSyncedLocalisationSearch.processVariants(result.prefixMatcher, selector, processor)
         }
     }
 }
diff --git a/src/main/kotlin/icu/windea/pls/localisation/codeInsight/completion/ParadoxLocalisationPropertyReferenceCompletionProvider.kt b/src/main/kotlin/icu/windea/pls/localisation/codeInsight/completion/ParadoxLocalisationPropertyReferenceCompletionProvider.kt
index 0badfb02f..e124f706b 100644
--- a/src/main/kotlin/icu/windea/pls/localisation/codeInsight/completion/ParadoxLocalisationPropertyReferenceCompletionProvider.kt
+++ b/src/main/kotlin/icu/windea/pls/localisation/codeInsight/completion/ParadoxLocalisationPropertyReferenceCompletionProvider.kt
@@ -52,8 +52,8 @@ class ParadoxLocalisationPropertyReferenceCompletionProvider : CompletionProvide
             true
         }
         when(category) {
-            ParadoxLocalisationCategory.Localisation -> ParadoxLocalisationSearch.processVariants(keyword, selector, processor)
-            ParadoxLocalisationCategory.SyncedLocalisation -> ParadoxSyncedLocalisationSearch.processVariants(keyword, selector, processor)
+            ParadoxLocalisationCategory.Localisation -> ParadoxLocalisationSearch.processVariants(result.prefixMatcher, selector, processor)
+            ParadoxLocalisationCategory.SyncedLocalisation -> ParadoxSyncedLocalisationSearch.processVariants(result.prefixMatcher, selector, processor)
         }
     }
 }