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@
@
-notes knows community- 2019/05/08
ネオアクシス株式会社 阿部覚
(tw:) @abesat
@関数Talk
第12回 公開版
@
@
前々回、すなわち
3月ののの会に参加されていた方✋
@関数Talkとしては第10回…の
内容をご記憶でしょうか?
 
@
@
@Middle
@MiddleBackの
おさらい♥おさらい♥
@
@
いずれも文字列から
途中の一部を取り出す関数でした
abcdefghijklmnop
おさらいおさらい
@
@
@MiddleBackでは、2つ目の引数で
文字列の最後にある?「不可視文字くん」を
勘定せねばならぬ、という仕様が
みなさんのヒンシュクを買いました
abcdefghijklmnop
おさらいおさらい
@
@
第10回では、
2つ目と3つ目の引数が
両方とも数値の場合でお話しました
1つ目の引数1つ目の引数 2つ目の引数2つ目の引数 3つ目の引数3つ目の引数
おさらいおさらい
@
@
つまり、4つある構文パターンのうち
IBMさんのヘルプIBMさんのヘルプ
ここしか見なかったので
今回、他のパターンも併せて、
文字の取り出し方の「向き」を確認します
と、いうことで 
おさらいおさらい
@
@
@Middle
@MiddleBackの
つづき
@
@
2つ目3つ目の引数が、数値か文字かで
組み合わせが4パターンになるので
仮のパターン名をつけます…
2つ目の引数 3つ目の引数
数値 数値
数値 文字
文字 数値
文字 文字
かずかずかずかず
かずもじかずもじ
もじかずもじかず
もじもじもじもじ
@
@
これまでと同様にパターン別の
フォームを用意して
条件を合わせて確認します
1つ目の引数1つ目の引数 2つ目の引数2つ目の引数 3つ目の引数3つ目の引数
左の見出しの式を持つ計算結果フィールド左の見出しの式を持つ計算結果フィールド
@
@
かずかずの場合
結果を
予想してみて
ください
@
@
かずかずの場合
@MiddleBackでは
不可視文字くんの影響
@
@
かずもじの場合
結果を
予想してみて
ください
@
@
かずもじの場合
@MiddleBackでは
不可視文字くんの影響
@
@
もじかずの場合
結果を
予想してみて
ください
@
@
もじかずの場合
@
@
もじもじの場合
結果を
予想してみて
ください
@
@
もじもじの場合
@
@
ここで以前、@Right、@RightBack、
@Left、@LeftBackでやったのと同様に
文字タイプ数値タイプ
@Right
@RightBack
@Left
@LeftBack
aaaaaXaaaaa
aaaaaXaaaaa
aaaaaXaaaaa
aaaaaXaaaaa
AAAAABBBBB
AAAAABBBBB
AAAAABBBBB
AAAAABBBBB
探索と取り出しの方向を確認します、
@
@ABCDEFGHIJ
ABCDEFGHIJ
各パターンを並べてみます
かずもじかずかず もじもじもじかず
@MiddleBack
ABCDEFGHIJ
ABCDEFGHIJ
ABCDEFGHIJ
ABCDEFGHIJ
ABCDEFGHIJ
ABCDEFGHIJ
@
@
ABCDEFGHIJ
@Middleの場合は方向が一定ですが
かずもじかずかず もじもじもじかず
ABCDEFGHIJ ABCDEFGHIJ ABCDEFGHIJ
@
@ABCDEFGHIJ
@MiddleBackでは
3つ目の引数が数か文字かで
取り方が分かれます
かずもじかずかず もじもじもじかず
@MiddleBack
ABCDEFGHIJ ABCDEFGHIJ ABCDEFGHIJ
@
@
ただしヘルプには
3つ目の引数が数値の場合について
こんなことが書かれてあります
(@Middle/@MiddleBackとも同じ記載)
IBMさんのヘルプIBMさんのヘルプ
@MiddleBackの場合
数値がマイナスなら
文字と同じ方向ということになります
@
@
第10回と併せて
@MiddleBackを使用する場合をまとめると
●
2つ目の引数が数値の時に
不可視文字君のカウントが必要
●
3つ目の引数が数値なら取り出す値は右側
(ただし正の数の場合)
●
3つ目の引数が文字なら取り出す値は左側
使うときはご留意ください
@
@
今回も
ご清聴ありがとう
ございました!

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