javaScript字符串工具类StringUtils详解

本文实例为大家分享了javaScript字符串工具类的具体代码,供大家参考,具体内容如下

StringUtils = {

isEmpty: function(input) {

return input == null || input == '';

},

isNotEmpty: function(input) {

return !this.isEmpty(input);

},

isBlank: function(input) {

return input == null || /^\s*$/.test(input);

},

isNotBlank: function(input) {

return !this.isBlank(input);

},

trim: function(input) {

return input.replace(/^\s+|\s+$/, '');

},

trimToEmpty: function(input) {

return input == null ? "" : this.trim(input);

},

startsWith: function(input, prefix) {

return input.indexOf(prefix) === 0;

},

endsWith: function(input, suffix) {

return input.lastIndexOf(suffix) === 0;

},

contains: function(input, searchSeq) {

return input.indexOf(searchSeq) >= 0;

},

equals: function(input1, input2) {

return input1 == input2;

},

equalsIgnoreCase: function(input1, input2) {

return input1.toLocaleLowerCase() == input2.toLocaleLowerCase();

},

containsWhitespace: function(input) {

return this.contains(input, ' ');

},

//生成指定个数的字符

repeat: function(ch, repeatTimes) {

var result = "";

for(var i = 0; i < repeatTimes; i++) {

result += ch;

}

return result;

},

deleteWhitespace: function(input) {

return input.replace(/\s+/g, '');

},

rightPad: function(input, size, padStr) {

return input + this.repeat(padStr, size);

},

leftPad: function(input, size, padStr) {

return this.repeat(padStr, size) + input;

},

//首小写字母转大写

capitalize: function(input) {

var strLen = 0;

if(input == null || (strLen = input.length) == 0) {

return input;

}

return input.replace(/^[a-z]/, function(matchStr) {

return matchStr.toLocaleUpperCase();

});

},

//首大写字母转小写

uncapitalize: function(input) {

var strLen = 0;

if(input == null || (strLen = input.length) == 0) {

return input;

}

return input.replace(/^[A-Z]/, function(matchStr) {

return matchStr.toLocaleLowerCase();

});

},

//大写转小写,小写转大写

swapCase: function(input) {

return input.replace(/[a-z]/ig, function(matchStr) {

if(matchStr >= 'A' && matchStr <= 'Z') {

return matchStr.toLocaleLowerCase();

} else if(matchStr >= 'a' && matchStr <= 'z') {

return matchStr.toLocaleUpperCase();

}

});

},

//统计含有的子字符串的个数

countMatches: function(input, sub) {

if(this.isEmpty(input) || this.isEmpty(sub)) {

return 0;

}

var count = 0;

var index = 0;

while((index = input.indexOf(sub, index)) != -1) {

index += sub.length;

count++;

}

return count;

},

//只包含字母

isAlpha: function(input) {

return /^[a-z]+$/i.test(input);

},

//只包含字母、空格

isAlphaSpace: function(input) {

return /^[a-z\s]*$/i.test(input);

},

//只包含字母、数字

isAlphanumeric: function(input) {

return /^[a-z0-9]+$/i.test(input);

},

//只包含字母、数字和空格

isAlphanumericSpace: function(input) {

return /^[a-z0-9\s]*$/i.test(input);

},

//数字

isNumeric: function(input) {

return /^(?:[1-9]\d*|0)(?:\.\d+)?$/.test(input);

},

//小数

isDecimal: function(input) {

return /^[-+]?(?:0|[1-9]\d*)\.\d+$/.test(input);

},

//负小数

isNegativeDecimal: function(input) {

return /^\-?(?:0|[1-9]\d*)\.\d+$/.test(input);

},

//正小数

isPositiveDecimal: function(input) {

return /^\+?(?:0|[1-9]\d*)\.\d+$/.test(input);

},

//整数

isInteger: function(input) {

return /^[-+]?(?:0|[1-9]\d*)$/.test(input);

},

//正整数

isPositiveInteger: function(input) {

return /^\+?(?:0|[1-9]\d*)$/.test(input);

},

//负整数

isNegativeInteger: function(input) {

return /^\-?(?:0|[1-9]\d*)$/.test(input);

},

//只包含数字和空格

isNumericSpace: function(input) {

return /^[\d\s]*$/.test(input);

},

isWhitespace: function(input) {

return /^\s*$/.test(input);

},

isAllLowerCase: function(input) {

return /^[a-z]+$/.test(input);

},

isAllUpperCase: function(input) {

return /^[A-Z]+$/.test(input);

},

defaultString: function(input, defaultStr) {

return input == null ? defaultStr : input;

},

defaultIfBlank: function(input, defaultStr) {

return this.isBlank(input) ? defaultStr : input;

},

defaultIfEmpty: function(input, defaultStr) {

return this.isEmpty(input) ? defaultStr : input;

},

//字符串反转

reverse: function(input) {

if(this.isBlank(input)) {

input;

}

return input.split("").reverse().join("");

},

//删掉特殊字符(英文状态下)

removeSpecialCharacter: function(input) {

return input.replace(/[!-/:-@\[-`{-~]/g, "");

},

//只包含特殊字符、数字和字母(不包括空格,若想包括空格,改为[ -~])

isSpecialCharacterAlphanumeric: function(input) {

return /^[!-~]+$/.test(input);

},

/**

* 校验时排除某些字符串,即不能包含某些字符串

* @param {Object} conditions:里面有多个属性,如下:

*

* @param {String} matcherFlag 匹配标识

* 0:数字;1:字母;2:小写字母;3:大写字母;4:特殊字符,指英文状态下的标点符号及括号等;5:中文;

* 6:数字和字母;7:数字和小写字母;8:数字和大写字母;9:数字、字母和特殊字符;10:数字和中文;

* 11:小写字母和特殊字符;12:大写字母和特殊字符;13:字母和特殊字符;14:小写字母和中文;15:大写字母和中文;

* 16:字母和中文;17:特殊字符、和中文;18:特殊字符、字母和中文;19:特殊字符、小写字母和中文;20:特殊字符、大写字母和中文;

* 100:所有字符;

* @param {Array} excludeStrArr 排除的字符串,数组格式

* @param {String} length 长度,可为空。1,2表示长度1到2之间;10,表示10个以上字符;5表示长度为5

* @param {Boolean} ignoreCase 是否忽略大小写

* conditions={matcherFlag:"0",excludeStrArr:[],length:"",ignoreCase:true}

*/

isPatternMustExcludeSomeStr: function(input, conditions) {

//参数

var matcherFlag = conditions.matcherFlag;

var excludeStrArr = conditions.excludeStrArr;

var length = conditions.length;

var ignoreCase = conditions.ignoreCase;

//拼正则

var size = excludeStrArr.length;

var regex = (size == 0) ? "^" : "^(?!.*(?:{0}))";

var subPattern = "";

for(var i = 0; i < size; i++) {

excludeStrArr[i] = Bee.StringUtils.escapeMetacharacterOfStr(excludeStrArr[i]);

subPattern += excludeStrArr[i];

if(i != size - 1) {

subPattern += "|";

}

}

regex = this.format(regex, [subPattern]);

switch(matcherFlag) {

case '0':

regex += "\\d";

break;

case '1':

regex += "[a-zA-Z]";

break;

case '2':

regex += "[a-z]";

break;

case '3':

regex += "[A-Z]";

break;

case '4':

regex += "[!-/:-@\[-`{-~]";

break;

case '5':

regex += "[\u4E00-\u9FA5]";

break;

case '6':

regex += "[a-zA-Z0-9]";

break;

case '7':

regex += "[a-z0-9]";

break;

case '8':

regex += "[A-Z0-9]";

break;

case '9':

regex += "[!-~]";

break;

case '10':

regex += "[0-9\u4E00-\u9FA5]";

break;

case '11':

regex += "[a-z!-/:-@\[-`{-~]";

break;

case '12':

regex += "[A-Z!-/:-@\[-`{-~]";

break;

case '13':

regex += "[a-zA-Z!-/:-@\[-`{-~]";

break;

case '14':

regex += "[a-z\u4E00-\u9FA5]";

break;

case '15':

regex += "[A-Z\u4E00-\u9FA5]";

break;

case '16':

regex += "[a-zA-Z\u4E00-\u9FA5]";

break;

case '17':

regex += "[\u4E00-\u9FA5!-/:-@\[-`{-~]";

break;

case '18':

regex += "[\u4E00-\u9FA5!-~]";

break;

case '19':

regex += "[a-z\u4E00-\u9FA5!-/:-@\[-`{-~]";

break;

case '20':

regex += "[A-Z\u4E00-\u9FA5!-/:-@\[-`{-~]";

break;

case '100':

regex += "[\s\S]";

break;

default:

alert(matcherFlag + ":This type is not supported!");

}

regex += this.isNotBlank(length) ? "{" + length + "}" : "+";

regex += "$";

var pattern = new RegExp(regex, ignoreCase ? "i" : "");

return pattern.test(input);

},

/**

* @param {String} message

* @param {Array} arr

* 消息格式化

*/

format: function(message, arr) {

return message.replace(/{(\d+)}/g, function(matchStr, group1) {

return arr[group1];

});

},

/**

* 把连续出现多次的字母字符串进行压缩。如输入:aaabbbbcccccd 输出:3a4b5cd

* @param {String} input

* @param {Boolean} ignoreCase : true or false

*/

compressRepeatedStr: function(input, ignoreCase) {

var pattern = new RegExp("([a-z])\\1+", ignoreCase ? "ig" : "g");

return result = input.replace(pattern, function(matchStr, group1) {

return matchStr.length + group1;

});

},

/**

* 校验必须同时包含某些字符串

* @param {String} input

* @param {Object} conditions:里面有多个属性,如下:

*

* @param {String} matcherFlag 匹配标识

* 0:数字;1:字母;2:小写字母;3:大写字母;4:特殊字符,指英文状态下的标点符号及括号等;5:中文;

* 6:数字和字母;7:数字和小写字母;8:数字和大写字母;9:数字、字母和特殊字符;10:数字和中文;

* 11:小写字母和特殊字符;12:大写字母和特殊字符;13:字母和特殊字符;14:小写字母和中文;15:大写字母和中文;

* 16:字母和中文;17:特殊字符、和中文;18:特殊字符、字母和中文;19:特殊字符、小写字母和中文;20:特殊字符、大写字母和中文;

* 100:所有字符;

* @param {Array} excludeStrArr 排除的字符串,数组格式

* @param {String} length 长度,可为空。1,2表示长度1到2之间;10,表示10个以上字符;5表示长度为5

* @param {Boolean} ignoreCase 是否忽略大小写

* conditions={matcherFlag:"0",containStrArr:[],length:"",ignoreCase:true}

*

*/

isPatternMustContainSomeStr: function(input, conditions) {

//参数

var matcherFlag = conditions.matcherFlag;

var containStrArr = conditions.containStrArr;

var length = conditions.length;

var ignoreCase = conditions.ignoreCase;

//创建正则

var size = containStrArr.length;

var regex = "^";

var subPattern = "";

for(var i = 0; i < size; i++) {

containStrArr[i] = Bee.StringUtils.escapeMetacharacterOfStr(containStrArr[i]);

subPattern += "(?=.*" + containStrArr[i] + ")";

}

regex += subPattern;

switch(matcherFlag) {

case '0':

regex += "\\d";

break;

case '1':

regex += "[a-zA-Z]";

break;

case '2':

regex += "[a-z]";

break;

case '3':

regex += "[A-Z]";

break;

case '4':

regex += "[!-/:-@\[-`{-~]";

break;

case '5':

regex += "[\u4E00-\u9FA5]";

break;

case '6':

regex += "[a-zA-Z0-9]";

break;

case '7':

regex += "[a-z0-9]";

break;

case '8':

regex += "[A-Z0-9]";

break;

case '9':

regex += "[!-~]";

break;

case '10':

regex += "[0-9\u4E00-\u9FA5]";

break;

case '11':

regex += "[a-z!-/:-@\[-`{-~]";

break;

case '12':

regex += "[A-Z!-/:-@\[-`{-~]";

break;

case '13':

regex += "[a-zA-Z!-/:-@\[-`{-~]";

break;

case '14':

regex += "[a-z\u4E00-\u9FA5]";

break;

case '15':

regex += "[A-Z\u4E00-\u9FA5]";

break;

case '16':

regex += "[a-zA-Z\u4E00-\u9FA5]";

break;

case '17':

regex += "[\u4E00-\u9FA5!-/:-@\[-`{-~]";

break;

case '18':

regex += "[\u4E00-\u9FA5!-~]";

break;

case '19':

regex += "[a-z\u4E00-\u9FA5!-/:-@\[-`{-~]";

break;

case '20':

regex += "[A-Z\u4E00-\u9FA5!-/:-@\[-`{-~]";

break;

case '100':

regex += "[\s\S]";

break;

default:

alert(matcherFlag + ":This type is not supported!");

}

regex += this.isNotBlank(length) ? "{" + length + "}" : "+";

regex += "$";

var pattern = new RegExp(regex, ignoreCase ? "i" : "");

return pattern.test(input);

},

//中文校验

isChinese: function(input) {

return /^[\u4E00-\u9FA5]+$/.test(input);

},

//去掉中文字符

removeChinese: function(input) {

return input.replace(/[\u4E00-\u9FA5]+/gm, "");

},

//转义元字符

escapeMetacharacter: function(input) {

var metacharacter = "^$()*+.[]|\\-?{}|";

if(metacharacter.indexOf(input) >= 0) {

input = "\\" + input;

}

return input;

},

//转义字符串中的元字符

escapeMetacharacterOfStr: function(input) {

return input.replace(/[\^\$\*\+\.

\|\\\-\?\{\}\|]/gm, "\\$&");

}

};

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