iOS常用正则表达式

aadk6168 3年前
   <h2>iOS 常用正则表达式</h2>    <p>正则表达式用于字符串处理、表单验证等场合,实用高效。现将一些常用的表达式收集于此,以备不时之需。</p>    <h3>匹配中文字符的正则表达式:</h3>    <pre>  <code class="language-objectivec">[\u4e00-\u9fa5]  </code></pre>    <p>评注:匹配中文还真是个头疼的事,有了这个表达式就好办了</p>    <h3>匹配双字节字符(包括汉字在内):</h3>    <pre>  <code class="language-objectivec">[^\x00-\xff]  </code></pre>    <p>评注:可以用来计算字符串的长度(一个双字节字符长度计2,ASCII字符计1)</p>    <h3>匹配空白行的正则表达式:</h3>    <pre>  <code class="language-objectivec">\n\s*\r  </code></pre>    <p>评注:可以用来删除空白行</p>    <h3>匹配HTML标记的正则表达式:</h3>    <pre>  <code class="language-objectivec"><(\S*?)[^>]*>.*?</\1>|<.*? />  </code></pre>    <p>评注:网上流传的版本太糟糕,上面这个也仅仅能匹配部分,对于复杂的嵌套标记依旧没有能力为力</p>    <h3>匹配首尾空白字符的正则表达式:</h3>    <pre>  <code class="language-objectivec">^\s*|\s*$  </code></pre>    <p>评注:可以用来删除行首行尾的空白字符(包括空格、制表符、换页符等等),非常有用的表达式</p>    <h3>匹配Email地址的正则表达式:</h3>    <pre>  <code class="language-objectivec">\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*  </code></pre>    <p>评注:表单验证时很实用</p>    <h3>匹配网址URL的正则表达式:</h3>    <pre>  <code class="language-objectivec">[a-zA-z]+://[^\s]*  </code></pre>    <p>评注:网上流传的版本功能很有限,上面这个基本可以满足需求</p>    <h3>匹配帐号是否合法(字母开头,允许5-16字节,允许字母数字下划线):</h3>    <pre>  <code class="language-objectivec">^[a-zA-Z][a-zA-Z0-9_]{4,15}$  </code></pre>    <p>评注:表单验证时很实用</p>    <h3>匹配国内电话号码:</h3>    <pre>  <code class="language-objectivec">\d{3}-\d{8}|\d{4}-\d{7}  </code></pre>    <p>评注:匹配形式如 0511-4405222 或 021-87888822</p>    <h3>匹配腾讯QQ号:</h3>    <pre>  <code class="language-objectivec">[1-9][0-9]{4,}  </code></pre>    <p>评注:腾讯QQ号从10000开始</p>    <h3>匹配中国邮政编码:</h3>    <pre>  <code class="language-objectivec">[1-9]\d{5}(?!\d)  </code></pre>    <p>评注:中国邮政编码为6位数字</p>    <h3>匹配身份证:</h3>    <pre>  <code class="language-objectivec">\d{15}|\d{18}  </code></pre>    <p>评注:中国的身份证为15位或18位</p>    <h3>匹配ip地址:</h3>    <pre>  <code class="language-objectivec">\d+\.\d+\.\d+\.\d+  </code></pre>    <p>评注:提取ip地址时有用</p>    <h3>匹配特定数字:</h3>    <pre>  <code class="language-objectivec">^[1-9]\d*$          //匹配正整数    ^-[1-9]\d*$      //匹配负整数    ^-?[1-9]\d*$         //匹配整数    ^[1-9]\d*|0$     //匹配非负整数(正整数 + 0)    ^-[1-9]\d*|0$         //匹配非正整数(负整数 + 0)    ^[1-9]\d*\.\d*|0\.\d*[1-9]\d*$         //匹配正浮点数    ^-([1-9]\d*\.\d*|0\.\d*[1-9]\d*)$     //匹配负浮点数    ^-?([1-9]\d*\.\d*|0\.\d*[1-9]\d*|0?\.0+|0)$     //匹配浮点数    ^[1-9]\d*\.\d*|0\.\d*[1-9]\d*|0?\.0+|0$         //匹配非负浮点数(正浮点数 + 0)    ^(-([1-9]\d*\.\d*|0\.\d*[1-9]\d*))|0?\.0+|0$        //匹配非正浮点数(负浮点数 + 0)    </code></pre>    <p>评注:处理大量数据时有用,具体应用时注意修正</p>    <h3>匹配特定字符串:</h3>    <pre>  <code class="language-objectivec">^[A-Za-z]+$        //匹配由26个英文字母组成的字符串    ^[A-Z]+$        //匹配由26个英文字母的大写组成的字符串    ^[a-z]+$        //匹配由26个英文字母的小写组成的字符串    ^[A-Za-z0-9]+$        //匹配由数字和26个英文字母组成的字符串    ^\w+$        //匹配由数字、26个英文字母或者下划线组成的字符串   </code></pre>    <h3>匹配中文:</h3>    <pre>  <code class="language-objectivec">[\u4e00-\u9fa5]   </code></pre>    <h3>英文字母:</h3>    <pre>  <code class="language-objectivec">[a-zA-Z]   </code></pre>    <h3>数字:</h3>    <pre>  <code class="language-objectivec">[0-9]   </code></pre>    <h3>匹配中文,英文字母和数字及_:</h3>    <pre>  <code class="language-objectivec">^[\u4e00-\u9fa5_a-zA-Z0-9]+$  </code></pre>    <p>同时判断输入长度:</p>    <pre>  <code class="language-objectivec">[\u4e00-\u9fa5_a-zA-Z0-9_]{4,10}  ^[\w\u4E00-\u9FA5\uF900-\uFA2D]*$   </code></pre>    <pre>  <code class="language-objectivec">一个正则表达式,只含有汉字、数字、字母、下划线不能以下划线开头和结尾:  ^(?!_)(?!.*?_$)[a-zA-Z0-9_\u4e00-\u9fa5]+$  其中:  ^  与字符串开始的地方匹配  (?!_)        不能以_开头  (?!.*?_$)        不能以_结尾  [a-zA-Z0-9_\u4e00-\u9fa5]+        至少一个汉字、数字、字母、下划线  $        与字符串结束的地方匹配    放在程序里前面加@,否则需要\\进行转义 @"^(?!_)(?!.*?_$)[a-zA-Z0-9_\u4e00-\u9fa5]+$"  (或者:@"^(?!_)\w*(?<!_)$"    或者  @" ^[\u4E00-\u9FA50-9a-zA-Z_]+$ "  )  </code></pre>    <pre>  <code class="language-objectivec">只含有汉字、数字、字母、下划线,下划线位置不限:  ^[a-zA-Z0-9_\u4e00-\u9fa5]+$  </code></pre>    <pre>  <code class="language-objectivec">由数字、26个英文字母或者下划线组成的字符串  ^\w+$  </code></pre>    <pre>  <code class="language-objectivec">2~4个汉字  @"^[\u4E00-\u9FA5]{2,4}$";   </code></pre>    <pre>  <code class="language-objectivec">^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$  </code></pre>    <h3>最长不得超过7个汉字,或14个字节(数字,字母和下划线)正则表达式</h3>    <pre>  <code class="language-objectivec">^[\u4e00-\u9fa5]{1,7}$|^[\dA-Za-z_]{1,14}$  </code></pre>    <h3>匹配月份的正则表达式</h3>    <pre>  <code class="language-objectivec">^[1-9]$|^1[0-2]$  </code></pre>    <p>注:个位数月份匹配方式 前面不能加 0。</p>    <pre>  <code class="language-objectivec">^0?[1-9]$|^1[0-2]$  </code></pre>    <p>注:个位数月份前可以加0或者不加。</p>    <pre>  <code class="language-objectivec">匹配年份19或者20  ^(19|20)[0-9]{2}$  </code></pre>    <h2>代码示例</h2>    <pre>  <code class="language-objectivec">+ (BOOL)isEmailAddress:(NSString*)candidate  {      NSString* emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";      NSPredicate* emailTest = [NSPredicate predicateWithFormat:@"<a href="/misc/goto?guid=4959674725336032795" title="self">self</a> MATCHES %@", emailRegex];      return [emailTest evaluateWithObject:candidate];  }    </code></pre>    <pre>  <code class="language-objectivec">-(NSNumber *)asNumber;{      NSString *regEx = @"^-?\\d+.?\\d?";      NSPredicate * pred      = [NSPredicate predicateWithFormat:@"<a href="/misc/goto?guid=4959674725336032795" title="self">self</a> MATCHES %@", regEx];      BOOL isMatch            = [pred evaluateWithObject:<a href="/misc/goto?guid=4959674725336032795" title="self">self</a>];      if (isMatch) {          return [NSNumber numberWithDouble:[<a href="/misc/goto?guid=4959674725336032795" title="self">self</a> doubleValue]];      }      return nil;  }    </code></pre>    <pre>  <code class="language-objectivec">//摘自NSString+BeeExtension.mm  - (BOOL)isUserName  {      NSString *      regex = @"(^[A-Za-z0-9]{3,20}$)";      NSPredicate *   pred = [NSPredicate predicateWithFormat:@"<a href="/misc/goto?guid=4959674725336032795" title="self">self</a> MATCHES %@", regex];            return [pred evaluateWithObject:<a href="/misc/goto?guid=4959674725336032795" title="self">self</a>];  }    - (BOOL)isPassword  {      NSString *      regex = @"(^[A-Za-z0-9]{6,20}$)";      NSPredicate *   pred = [NSPredicate predicateWithFormat:@"<a href="/misc/goto?guid=4959674725336032795" title="self">self</a> MATCHES %@", regex];            return [pred evaluateWithObject:<a href="/misc/goto?guid=4959674725336032795" title="self">self</a>];    }    - (BOOL)isEmail  {      NSString *      regex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";      NSPredicate *   pred = [NSPredicate predicateWithFormat:@"<a href="/misc/goto?guid=4959674725336032795" title="self">self</a> MATCHES %@", regex];            return [pred evaluateWithObject:<a href="/misc/goto?guid=4959674725336032795" title="self">self</a>];  }    - (BOOL)isUrl  {      NSString *      regex = @"http(s)?:\\/\\/([\\w-]+\\.)+[\\w-]+(\\/[\\w- .\\/?%&=]*)?";      NSPredicate *   pred = [NSPredicate predicateWithFormat:@"<a href="/misc/goto?guid=4959674725336032795" title="self">self</a> MATCHES %@", regex];            return [pred evaluateWithObject:<a href="/misc/goto?guid=4959674725336032795" title="self">self</a>];  }    - (BOOL)isTelephone  {      NSString * MOBILE = @"^1(3[0-9]|5[0-35-9]|8[025-9])\\d{8}$";      NSString * CM = @"^1(34[0-8]|(3[5-9]|5[017-9]|8[278])\\d)\\d{7}$";      NSString * CU = @"^1(3[0-2]|5[256]|8[56])\\d{8}$";      NSString * CT = @"^1((33|53|8[09])[0-9]|349)\\d{7}$";      NSString * PHS = @"^0(10|2[0-5789]|\\d{3})\\d{7,8}$";      NSPredicate *regextestmobile = [NSPredicate predicateWithFormat:@"<a href="/misc/goto?guid=4959674725336032795" title="self">self</a> MATCHES %@", MOBILE];      NSPredicate *regextestcm = [NSPredicate predicateWithFormat:@"<a href="/misc/goto?guid=4959674725336032795" title="self">self</a> MATCHES %@", CM];      NSPredicate *regextestcu = [NSPredicate predicateWithFormat:@"<a href="/misc/goto?guid=4959674725336032795" title="self">self</a> MATCHES %@", CU];      NSPredicate *regextestct = [NSPredicate predicateWithFormat:@"<a href="/misc/goto?guid=4959674725336032795" title="self">self</a> MATCHES %@", CT];      NSPredicate *regextestphs = [NSPredicate predicateWithFormat:@"<a href="/misc/goto?guid=4959674725336032795" title="self">self</a> MATCHES %@", PHS];        return  [regextestmobile evaluateWithObject:<a href="/misc/goto?guid=4959674725336032795" title="self">self</a>]   ||              [regextestphs evaluateWithObject:<a href="/misc/goto?guid=4959674725336032795" title="self">self</a>]      ||              [regextestct evaluateWithObject:<a href="/misc/goto?guid=4959674725336032795" title="self">self</a>]       ||              [regextestcu evaluateWithObject:<a href="/misc/goto?guid=4959674725336032795" title="self">self</a>]       ||              [regextestcm evaluateWithObject:<a href="/misc/goto?guid=4959674725336032795" title="self">self</a>];  }    </code></pre>    <p> </p>    <p>来自: <a href="/misc/goto?guid=4959674725635151357" rel="nofollow">http://blog.treney.com/index.php/archives/RegulaExpressions.html</a></p>    <p> </p>