java - Unicode Regex in Scala REPL -


मुझे यूनिकोड पत्र ( \ p {L} ) के शब्द पता लगाना है।

स्काला का आरईपीएल निम्नलिखित कथन के लिए false वापस देता है, जबकि जावा में यह true है (जो सही व्यवहार है):

Java.util.regex.Pattern.compile ("\\ p {L}")। मैटचर ("ए")। मैचों ()

जावा और स्कला दोनों JRE में चल रहे हैं 1.7:

System.getProperty ("java.version") देता है "1.7.0_60-ea"

क्या इसके लिए कारण हो सकता है?

संभवतः दुभाषिए के भीतर उपयोग किए जाने वाले गैर-संगत वर्ण एन्कोडिंग । उदाहरण के लिए, यहां मेरा आउटपुट है: 

  scala & gt; System.getProperty ("file.encoding") res0: स्ट्रिंग = UTF-8 स्केल & gt; Java.util.regex.Pattern.compile ("\\ p {L}")। मैटचर ("ए")। मैचों () res1: बूलियन = सच

तो समाधान है scala के साथ -dfile.encoding = UTF-8 को चलाने के लिए। नोट, हालांकि, (जो थोड़ी पुरानी है):

स्काला के लिए डिफ़ॉल्ट वर्ण एन्कोडिंग सेट करने के लिए केवल एक ही विश्वसनीय तरीके से आपके आवेदन को चलाने से पहले $ JAVA_OPTS सेट करना है:

$ JAVA_OPTS = "- Dfile.encoding = utf8" scala [...] बस scala -file.encoding = utf8 सेट करने की कोशिश कर रहा है ऐसा करने लगते हैं [...]

यहां मामला नहीं था, लेकिन यह भी हो सकता है: वैकल्पिक रूप से, आपका "एक" चिह्न "a" द्वारा पीछा किया जा सकता है, जैसे: 

  स्कला & gt; Println ("a \ u0308") स्केल & gt; Java.util.regex.Pattern.compile ("\\ p {L}")। मैटचर ("a \ u0308") मैचों () res1: बूलियन = गलत

यह है कभी-कभी कुछ प्रणालियों पर एक समस्या है, जो कि डायैरिटिक्स बनाते हैं (मुझे लगता है कि ओएस एक्स एक है, कम से कम कुछ संस्करणों में)। अधिक जानकारी के लिए,।


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