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正则表达式的应用案例

Posted on | In Regular Expression

Names

  • Rules
    • include a-z, A-Z
    • Must start with A-Z
    • No numbers
    • No symbols

  • Regex

      ^(?!.*\s\s)(?!.*\.\.)(?!.*,,)[A-Z][a-zA-Z .,]{2,30}$
  • Explaination
    1. ^$ -> 开始于结束符号
    2. [A-Z][a-zA-Z .,]{2,30} -> 大写字母开头，后面包含大小写字母，.号，,号以及名字长度为{2,30}个字符
    3. 增加过滤条件
      • (?!.*\s\s), 过滤掉有两个空格及以上的名字
      • (?!.*\.\.), 过滤掉有两个.及以上的名字
      • (?!.*,,), 过滤掉有两个,及以上的名字

Emails

  • Rules
    • include a-z, A-Z
    • include @
  • Regex 
      (?!.*\.\.)([\w.\-#!$%&'*+\/=?^_{}|~]{1,35})@([\w.\-]+)\.([a-zA-Z]{2,10})
  • Explaination
    1. ([\w.\-#!$%&'*+\/=?^_{}|~]{1,35}) ,匹配@之前的可能字符，限定长度为{1,35}
    2. @符号
    3. ([\w.\-]+), 匹配@之后，.之前可能的字符，可能有xxx@xx.xx的情况
    4. ([a-zA-Z]{2,10}), 匹配.之后的字符，限定长度为{2,10}
    5. (?!.*\.\.) , 过滤条件，过滤掉有..情况

URLs

  • Rules
    • Must be Valid

  • Regex

      ^(?:http|https|ftp):\/\/[a-zA-Z0-9_~:\-\/?#[\]@!$&'()*+,;=`^.%]+\.[a-zA-Z0-9_~:\-\/?#[\]@!$&'()*+,;=`^.%]+$
  • Explaination
    1. (?:http|https|ftp) —> 匹配三种中 的一种
    2. :
    3. \/\/[a-zA-Z0-9_~:\-\/?#[\]@!$&'()*+,;=^.%]+ –> 匹配域名
    4. . –> 至少有一个.
    5. \/\/[a-zA-Z0-9_~:\-\/?#[\]@!$&'()*+,;=^.%]+` –> 匹配子域名

IP Address

  • Rules
    1. 250 - 255 –> 25[0-5]
    2. 200 - 249 –> 2[0-4][0-9]
    3. 100 - 199 –> 1[0-9][0-9]
    4. 000 - 099 –> 0?[0-9][0-9]?

  • Regex

      ^(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|0?[0-9][0-9]?)\.(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|0?[0-9][0-9]?)\.(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|0?[0-9][0-9]?)\.(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|0?[0-9][0-9]?)$

Datas

  • Rule
    • Month/Day/Year

  • Regex

      ^(?:0?[1-9]|1[012])([\/\-])(?:0?[1-9]|1[0-9]|2[0-9]|3[01])\1(?:20[0-4][0-9]|2050)$
  • Explaination
    1. Month –> (0?[1-9]|1[0-2]])
    2. Day –> (0?[1-9]|1[0-9])|2[0-9]|3[01])
    3. Year –> (20[0-4][0-9]|2050) , from 2000-2050

Time

  • Rules
    • 12 Hour Format
      • Hour: 1-12
      • Minutes: 0-59
      • Seconds: 0-59
    • 24 Hour Format
      • Hour: 0-24
      • Minutes: 0-59
      • Seconds: 0-59
  • Regex
    • 12-hour format 
        ^0?(?:[1-9]|1[012])\:(?:[0-5]?[0-9])(?:\:[0-5]?[0-9])?(?: am| pm| AM | PM)?$
    • 24-hour format 
        ^(?:0?[0-9]|1[0-9]|2[0-3]):(?:[0-5]?[0-9])(?::[0-5]?[0-9])?(?: GMT| EST)?$

Post Code

  • Rules
    • No Rule
  • Regex
    • Pakistan 
        ^\d{5}$
    • India 
        ^\d{6}$
    • CANADA 
        ^[A-Z]\d[A-Z] \d[A-Z]\d$`
    • USA 
        ^\d{5}(?:-\d{4})?$`
    • UK 
        ^(?:[A-Z]{1,2}\d{1,2} \d[A-Z]{2})|(?:[A-Z]{1,2}\d[A-Z] \d[A-Z]{2})$`

Credit Cards

  • Rule
    1. Visa
      • 16 digit
      • Start with 4
      • 4xxxxxxxxxxxxxxx
      • 4xxx-xxxx-xxxx-xxxx
    2. MasterCard
      • 16 digit
      • start with 51 to 55
      • 51xxxxxxxxxxxxxx
      • 52xx-xxxx-xxxx-xxxx
      • 53xx-xxxx-xxxx-xxxx
      • 54xx-xxxx-xxxx-xxxx
      • 55xx-xxxx-xxxx-xxxx
    3. Discover
      • 16 digit
      • Start with 6011
      • 6011xxxxxxxxxxxxx
      • 6011-xxxx-xxxx-xxxx
    4. American Express
      • 15 digit
      • start with 34 or 37
      • 34xxxxxxxxxxxxx
      • 37xx-xxxxxx-xxxxx
    5. China Union Pay
      • 16 digit
      • Start with 62
      • 62xxxxxxxxxxxxxx
      • 62xx-xxxx-xxxx-xxxx
  • Regex
    • Visia & MasterCard & Discover & Union Pay 
        ^(4\d{3}|5[1-5]\d{2}|62\d{2}|6011)[ -]?(\d{4}[ -]?)(\d{4}[ -]?)(\d{4})$
    • American Express 
        ^(34|37\d{2})[ -]?(\d{6}[ -]?)(\d{5
    • Combine tow
      ^(?:(?:4\d{3}|5[1-5]\d{2}|6011|62\d{2})([\- ]?)\d{4}\1\d{4}\1\d{4})|(?:(?:3[47])\d{2}([\- ]?)\d{6}\2\d{5})$

Password

  • Rule
    1. length 8 to 15
    2. At least 1 digit
    3. At least 1 a-z
    4. At least 1 A-Z
    5. At least 1 symbol

  • Regex

      ^(?=.*\d)(?=.*[A-Z])(?=.*[a-z])(?=.*[~!@#$%^&*{}\-[\];:<>'"?|]).{8,15}$
  • Explaination
    • ^.{8,15}$ –> 匹配任意字符，限定长度
    • (?=.*\d) –> 过滤器，匹配的字符中至少包含一个数字
    • (?=.*[A-Z])(?=.*[a-z]) –>过滤器，匹配的字符中至少包含一个大小写字母
    • (?=.*[~!@#$%^&*{}\-[\];:<>'"?|]) –>过滤器，匹配字符中至少包含一个符号

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