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package com.dollearn.student.utils
 
import android.text.InputFilter
import android.text.Spanned
import java.util.regex.Pattern
 
class ChineseFilter:InputFilter {
    override fun filter(
        source: CharSequence?,
        start: Int,
        end: Int,
        dest: Spanned?,
        dstart: Int,
        dend: Int
    ): CharSequence? {
        val p = Pattern.compile(
            "^([\\u4e00-\\u9fa5]{1,20})\$",
            Pattern.UNICODE_CASE or Pattern.CASE_INSENSITIVE
        )
        val m = p.matcher(source.toString())
        if (!m.find()) return ""
        return null
    }
}