$re = '/([ぁ-ヿ、]+)\n(.+)\n\n/';
$str = '割れる（われる）
to break, to be smashed; to split, to crack, to fissure, to be torn; to be divided (opinion, vote, etc.), to split (e.g. of a party); to come to light, to become clear, to be identified, to be revealed; to be distorted (of a sound); to be divisible (without a remainder); to go below a minimum
話す（はなす）
to talk, to speak, to converse, to chat; to tell, to explain, to narrate, to mention, to describe, to discuss; to speak (a language)
燃える（もえる）
to burn, to get fired up
辞書（じしょ）
dictionary, lexicon; letter of resignation
なので
because, as, since
なのに
and yet, despite this, but even so, but even then, however, nevertheless, for all that, notwithstanding that
働く（はたらく）
to work, to labor, to labour; to function, to operate, to be effective, to work (i.e. ... works), to come into play; to commit (e.g. a crime), to perpetrate, to do, to act, to practise, to practice; to be conjugated
動く（うごく）
to move, to stir, to shift, to shake, to swing; to operate, to run, to go, to work; to make a move, to take action, to act, to go into action; to be touched, to be influenced; to change, to vary, to fluctuate, to waver; to be transferred
吊る（つる）
to hang, to suspend, to sling, to wear (e.g. a sword), to put up (e.g. a shelf); to hang oneself; to hoist an opponent off of his feet by his loincloth; to turn upwards (as if being pulled), to be slanted (of eyes); to pucker (e.g. of a seam), to be pulled tight
必ず（かならず）
always, without exception, necessarily, certainly, without fail, positively, invariably
気づく（きづく）
to notice, to recognize, to recognise, to become aware of, to perceive, to realize, to realise
校訓（こうくん）
school precepts
進捗（しんちょく）
progress, being under way
助かる（たすかる）
to be saved, to be rescued, to survive; to escape harm, to be spared damage; to be helped, to be saved trouble
補助（ほじょ）
assistance, support, aid, help; subsidy, supplement, subvention, grant-in-aid; auxiliary, subsidiary; spot (in bodybuilding)
助言（じょげん）
advice, suggestion
外注（がいちゅう）
outside order, outsourcing, custom (manufacture)
返却（へんきゃく）
return of something, repayment
発言（はつげん）
statement, remark, observation, utterance, speech, proposal
十人十色（じゅうにんといろ）
several men, several minds, everyone has his own ideas and tastes, everyone has his own interests and ideas, different strokes for different folks
理由（りゆう）
reason, pretext, motive
自宅（じたく）
one\'s home, one\'s house
在宅勤務（ざいたくきんむ）
working at home, telecommuting
残業（ざんぎょう）
overtime (work)
天狗（てんぐ）
tengu, long-nosed goblin; bragging, conceit, braggart, boaster, conceited person
南京錠（ナンキンじょう）
padlock
錠剤（じょうざい）
pill, lozenge, tablet
悪魔（あくま）
devil, demon, fiend; Satan, the Devil; Māra, evil spirits or forces that hinder one\'s path to enlightenment
紙ばさみ（かみばさみ）
paper holder, paper clip
潜水艦（せんすいかん）
submarine
消火栓（しょうかせん）
fire hydrant
地球儀（ちきゅうぎ）
globe (map)
三つ葉のクローバー（みつばのクローバー）
three-leaf clover
工場（こうじょう）
factory, plant, mill, workshop
トイレットペーパー
toilet paper
蛇口（じゃぐち）
faucet, tap
説明（せつめい）
explanation, exposition
解説（かいせつ）
explanation, commentary, exposition, elucidation
説得（せっとく）
persuasion
まず
first (of all), firstly, to start with, above all; probably, almost (certainly), hardly, practically, more or less; anyway, at any rate, for now (at least), for the time being
次（つぎ、つぐ、ジ）
next, order, sequence
最後（さいご）
end, conclusion; last, final, latest, most recent; no sooner than, once, right after (often having negative consequences); one\'s final moments
ツイート
tweet, Twitter post
ボール
ball; ball (pitch that falls outside of the strike zone); bowl; board (cardboard, pasteboard, etc.)
雪だるま（ゆきだるま）
snowman
テント
tent
看病人（かんびょうにん）
nurse
スパナ
spanner, wrench
恐竜（きょうりゅう）
dinosaur
ゴルフ
golf
砂時計（すなどけい）
hourglass
弟子（でし）
pupil, disciple, adherent, follower, apprentice, young person, teacher\'s student-helper
ショッピングカート
shopping cart
熱気球（ねつききゅう）
hot-air balloon
水桶（みずおけ）
pail (for water), bucket; cistern, water tank
賞杯（しょうはい）
trophy, prize cup
トロフィー
trophy
並ぶ（ならぶ）
to line up, to stand in a line; to rival, to match, to equal
困る（こまる）
to be troubled, to have difficulty, to be in a fix, to be at a loss, to be stumped, to be embarrassed; to be bothered, to be inconvenienced, to be annoyed; to be badly off, to be hard up, to be in straitened circumstances
確認（かくにん）
confirmation, verification, validation, review, check, affirmation, identification
早退（そうたい）
leaving early
送る（おくる）
to send (a thing), to dispatch, to despatch, to transmit; to take or escort (a person somewhere), to see off (a person); to bid farewell (to the departed), to bury; to spend (time), to live one\'s life; to pass (down the line); to affix okurigana
書類（しょるい）
document, official papers
とのこと
I\'m told, is what I heard, is how it is, apparently, is what they said
撮影（さつえい）
photography (still or motion), photographing, filming, shooting, (video) recording
優先順位（ゆうせんじゅんい）
priority, order of precedence
必要（ひつよう）
necessary, needed, essential, indispensable; necessity, need, requirement
気が抜ける（きがぬける）
to lose heart, to lose interest, to lose motivation, to be discouraged; to become stale (i.e. of a carbonated beverage), to go flat, to lose flavor, to lose flavour, to be exhausted, to feel spent
出身（しゅっしん）
person\'s origin (e.g. city, country, parentage, school)
弄ぶ（もてあそぶ）
to play with (a toy, one\'s hair, etc.), to fiddle with; to toy with (one\'s emotions, etc.), to trifle with; to do with something as one pleases; to appreciate
聖（セイ、ひじり、ショウ）
holy, saint, sage, master, priest
Created with Japanese for iOS®
';
$subst = "$1\t$1\t$2\n";
$result = preg_replace($re, $subst, $str);
echo "The result of the substitution is ".$result;
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php