文字種判定

コード

<script>
"use strict";
(function(window, document, undefined){
function $(id, val){
	var el = document.getElementById(id);
	if( val!==undefined) {
		el.value=val;
	}
	return el.value;
}

var _judges=["", "空白", "アルファベット", "ひらがな"];

function isFirst(c, text){
	return (new RegExp("^"+c)).test(text)? _judges.indexOf("空白"): 0;
}
function isLast(c, text){
	return (new RegExp(c+"$")).test(text)? _judges.indexOf("空白"): 0;
}
function isSpace(c){
	return ( /[　\s]/.test(c) )? _judges.indexOf("空白") : 0;
}
function isAlpha(c){
	return ( /[a-zA-Z]/.test(c) )? _judges.indexOf("アルファベット") : 0;
}
function isHiragana(c){
	return ( /[あ-んを]/.test(c) )? _judges.indexOf("ひらがな") : 0;
}
function getCharType(c){
	return isSpace(c) || isAlpha(c) || isHiragana(c) || 0;
}

function judge(){
	
	var c = $('ipt_c'),
	    text = $('ipt_text'),
	    result = '';
	
	var re = text.match( (new RegExp("(.?)"+c+"(.?)")) );
	if( re ){
		var before = _judges[ isFirst(c, text) || getCharType(re[1]) ],
		    after = _judges[ isLast(c, text) || getCharType(re[2]) ];

		if( before === after ){
			result += before + "です。";
		}else{
			result += "前が" + before + "で後ろが" + after + "です。";
		}
	}
	$('ipt_out', result);

}

window.$ = $;
window.judge = judge;
})(this, document, void(0));
</script>
実験室

文字種判定

サンプル

コード
