seyfer

<?php

/**
 * Negabase
 * To convert a decimal to negative base.
 * Divide the number by the negative base.
 * Acquire the whole number quotient and remainder.
 * If the remainder is negative, add 1 to the quotient and add the absolute value of the base to the remainder.
 * Divide the quotient by the negative base... rinse and repeat until the quotient is 0.
 * Aggregate the remainders in reverse (as a stack), and you have your negative base representation.

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terrancesnyder

Regex for matching ALL Japanese common & uncommon Kanji (4e00 – 9fcf) ~ The Big Kahuna!
([一-龯])

Regex for matching Hirgana or Katakana
([ぁ-んァ-ン])

Regex for matching Non-Hirgana or Non-Katakana
([^ぁ-んァ-ン])

Regex for matching Hirgana or Katakana or basic punctuation (、。’)