正規表現

正規表現が使えるようになってたことを今更知っちゃった...。 今まで文字列が数字かどうか判定するのって、ガリガリコードを書いてたけど、これからは正規表現を使ってある程度スマートに書けるってことだな。 とりあえず、この条件の数値が判定できることを目標にしてみた。 3桁ごとのカンマ区切りなし 符号(+,-)あり/なし 実数値 で、ポイントとなるのはNSStringのrangeOfStringってメソッド。 こういった引数を指定する。 NSString:rangeOfString:は正規表現(文字列)を指定 NSString:rangeOfString:options:は正規表現で検索するという意味のNSRegularExpressionSearchという値を指定 作った判定関数はこんなかんじ。 ※テスト用にコンソール出力処理が入ってるけど、あってもなくてもOK。 Boolean IsNumbers(NSString* string) { // 変数定義 NSRange range; Boolean result = false; NSString* expression = @"^[-|+|[.]|[0-9]|]{1}[.|]?[0-9]*"; // 数値かチェックする range = [string rangeOfString:expression options:NSRegularExpressionSearch]; if (range.location != NSNotFound) { result = true; // 数値の場合 } else { result = false; // 数値でない場合 } // 確認するためにコンソールにログを出力する if (true == result) { NSLog(@"[O] %@ is number!!",string); } else { NSLog(@"[X] %@ is not number.",string); } return result; } テスト用の関数はこんな感じ。 int main (int argc, const char * argv[]) { // 変数 Boolean result = false; // テスト１ result = IsNumbers(@""); result = IsNumbers(@"+"); result = IsNumbers(@"-"); result = IsNumbers(@"*"); result = IsNumbers(@"."); // テスト２ result = IsNumbers(@"1"); result = IsNumbers(@"+1"); result = IsNumbers(@"-1"); result = IsNumbers(@"*1"); // テスト３ result = IsNumbers(@"0"); result = IsNumbers(@"+0"); result = IsNumbers(@"-0"); result = IsNumbers(@"*0"); // テスト４ result = IsNumbers(@"0."); result = IsNumbers(@"+0."); result = IsNumbers(@"-0."); result = IsNumbers(@"*0."); // テスト５ result = IsNumbers(@"1."); result = IsNumbers(@"+1."); result = IsNumbers(@"-1."); result = IsNumbers(@"*1."); // テスト６ result = IsNumbers(@".0"); result = IsNumbers(@"+.0"); result = IsNumbers(@"-.0"); result = IsNumbers(@"*.0"); // テスト７ result = IsNumbers(@".1"); result = IsNumbers(@"+.1"); result = IsNumbers(@"-.1"); result = IsNumbers(@"*.1"); // テスト８ result = IsNumbers(@"0.0"); result = IsNumbers(@"+0.0"); result = IsNumbers(@"-0.0"); result = IsNumbers(@"*0.0"); // テスト９ result = IsNumbers(@"0.1"); result = IsNumbers(@"+0.1"); result = IsNumbers(@"-0.1"); result = IsNumbers(@"*0.1"); // テスト１０ result = IsNumbers(@"1.0"); result = IsNumbers(@"+1.0"); result = IsNumbers(@"-1.0"); result = IsNumbers(@"*1.0"); // テスト１１ result = IsNumbers(@"1.1"); result = IsNumbers(@"+1.1"); result = IsNumbers(@"-1.1"); result = IsNumbers(@"*1.1"); // テスト１２ result = IsNumbers(@"1.10"); result = IsNumbers(@"+1.10"); result = IsNumbers(@"-1.10"); result = IsNumbers(@"*1.10"); // テスト１３ result = IsNumbers(@"1.01"); result = IsNumbers(@"+1.01"); result = IsNumbers(@"-1.01"); result = IsNumbers(@"*1.01"); // テスト１４ result = IsNumbers(@"01.1"); result = IsNumbers(@"+01.1"); result = IsNumbers(@"-01.1"); result = IsNumbers(@"*01.1"); return 0; } 結果はこんな感じ。 [Switching to process 12445 thread 0x0] 2012-01-14 00:13:00.036 ProtoAnalysisString[12445:707] [X] is not number. 2012-01-14 00:13:00.088 ProtoAnalysisString[12445:707] [O] + is number!! 2012-01-14 00:13:00.089 ProtoAnalysisString[12445:707] [O] - is number!! 2012-01-14 00:13:00.090 ProtoAnalysisString[12445:707] [X] * is not number. 2012-01-14 00:13:00.090 ProtoAnalysisString[12445:707] [O] . is number!! 2012-01-14 00:13:00.091 ProtoAnalysisString[12445:707] [O] 1 is number!! 2012-01-14 00:13:00.092 ProtoAnalysisString[12445:707] [O] +1 is number!! 2012-01-14 00:13:00.092 ProtoAnalysisString[12445:707] [O] -1 is number!! 2012-01-14 00:13:00.093 ProtoAnalysisString[12445:707] [X] *1 is not number. 2012-01-14 00:13:00.094 ProtoAnalysisString[12445:707] [O] 0 is number!! 2012-01-14 00:13:00.094 ProtoAnalysisString[12445:707] [O] +0 is number!! 2012-01-14 00:13:00.095 ProtoAnalysisString[12445:707] [O] -0 is number!! 2012-01-14 00:13:00.096 ProtoAnalysisString[12445:707] [X] *0 is not number. 2012-01-14 00:13:00.096 ProtoAnalysisString[12445:707] [O] 0. is number!! 2012-01-14 00:13:00.097 ProtoAnalysisString[12445:707] [O] +0. is number!! 2012-01-14 00:13:00.098 ProtoAnalysisString[12445:707] [O] -0. is number!! 2012-01-14 00:13:00.098 ProtoAnalysisString[12445:707] [X] *0. is not number. 2012-01-14 00:13:00.099 ProtoAnalysisString[12445:707] [O] 1. is number!! 2012-01-14 00:13:00.100 ProtoAnalysisString[12445:707] [O] +1. is number!! 2012-01-14 00:13:00.100 ProtoAnalysisString[12445:707] [O] -1. is number!! 2012-01-14 00:13:00.102 ProtoAnalysisString[12445:707] [X] *1. is not number. 2012-01-14 00:13:00.103 ProtoAnalysisString[12445:707] [O] .0 is number!! 2012-01-14 00:13:00.104 ProtoAnalysisString[12445:707] [O] +.0 is number!! 2012-01-14 00:13:00.104 ProtoAnalysisString[12445:707] [O] -.0 is number!! 2012-01-14 00:13:00.105 ProtoAnalysisString[12445:707] [X] *.0 is not number. 2012-01-14 00:13:00.105 ProtoAnalysisString[12445:707] [O] .1 is number!! 2012-01-14 00:13:00.106 ProtoAnalysisString[12445:707] [O] +.1 is number!! 2012-01-14 00:13:00.107 ProtoAnalysisString[12445:707] [O] -.1 is number!! 2012-01-14 00:13:00.107 ProtoAnalysisString[12445:707] [X] *.1 is not number. 2012-01-14 00:13:00.108 ProtoAnalysisString[12445:707] [O] 0.0 is number!! 2012-01-14 00:13:00.109 ProtoAnalysisString[12445:707] [O] +0.0 is number!! 2012-01-14 00:13:00.110 ProtoAnalysisString[12445:707] [O] -0.0 is number!! 2012-01-14 00:13:00.111 ProtoAnalysisString[12445:707] [X] *0.0 is not number. 2012-01-14 00:13:00.111 ProtoAnalysisString[12445:707] [O] 0.1 is number!! 2012-01-14 00:13:00.112 ProtoAnalysisString[12445:707] [O] +0.1 is number!! 2012-01-14 00:13:00.113 ProtoAnalysisString[12445:707] [O] -0.1 is number!! 2012-01-14 00:13:00.113 ProtoAnalysisString[12445:707] [X] *0.1 is not number. 2012-01-14 00:13:00.114 ProtoAnalysisString[12445:707] [O] 1.0 is number!! 2012-01-14 00:13:00.115 ProtoAnalysisString[12445:707] [O] +1.0 is number!! 2012-01-14 00:13:00.116 ProtoAnalysisString[12445:707] [O] -1.0 is number!! 2012-01-14 00:13:00.116 ProtoAnalysisString[12445:707] [X] *1.0 is not number. 2012-01-14 00:13:00.117 ProtoAnalysisString[12445:707] [O] 1.1 is number!! 2012-01-14 00:13:00.118 ProtoAnalysisString[12445:707] [O] +1.1 is number!! 2012-01-14 00:13:00.118 ProtoAnalysisString[12445:707] [O] -1.1 is number!! 2012-01-14 00:13:00.119 ProtoAnalysisString[12445:707] [X] *1.1 is not number. 2012-01-14 00:13:00.120 ProtoAnalysisString[12445:707] [O] 1.10 is number!! 2012-01-14 00:13:00.120 ProtoAnalysisString[12445:707] [O] +1.10 is number!! 2012-01-14 00:13:00.121 ProtoAnalysisString[12445:707] [O] -1.10 is number!! 2012-01-14 00:13:00.122 ProtoAnalysisString[12445:707] [X] *1.10 is not number. 2012-01-14 00:13:00.123 ProtoAnalysisString[12445:707] [O] 1.01 is number!! 2012-01-14 00:13:00.123 ProtoAnalysisString[12445:707] [O] +1.01 is number!! 2012-01-14 00:13:00.124 ProtoAnalysisString[12445:707] [O] -1.01 is number!! 2012-01-14 00:13:00.125 ProtoAnalysisString[12445:707] [X] *1.01 is not number. 2012-01-14 00:13:00.126 ProtoAnalysisString[12445:707] [O] 01.1 is number!! 2012-01-14 00:13:00.127 ProtoAnalysisString[12445:707] [O] +01.1 is number!! 2012-01-14 00:13:00.128 ProtoAnalysisString[12445:707] [O] -01.1 is number!! 2012-01-14 00:13:00.128 ProtoAnalysisString[12445:707] [X] *01.1 is not number. Program ended with exit code: 0 一応、判定できとるっぽいけど、正規表現部分はあまり自身がない...間違ってたらコメントでも何でもよいので教えてください。 あと、整数部分に3桁ごとにカンマがある数字は未対応...そのうち...がんばります。 んまま、メモってことで。

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