Question

目前正则表达式仅验证以.jpg .jpeg .png和.gif结尾的简单HTML图片链接

是否有一种简单的方法可以修改以下正则表达式以接受i.imgur.com/____.extension等链接或多个句点分隔的链接，例如来自维基百科等网站/论坛的图片。

例如，如何更改当前正则表达式以接受此类链接？ https://upload.wikimedia.org/wikipedia/commons/2/23/The_river_effect_in_justified_text.jpg

当前的正则表达式是：

 ([a-z\-_0-9\/\:\.]*\.(jp$g|png|gif)$)

我知道我可以用它来检查匹配[]内任何字符的字符。

[a-z\-_0-9\/\:\.]*\.

以下是我正在尝试接受图像的正则表达式的段。以前这是

的正则表达式

custonValidation：customRegexp =＆＃34; （[A-Z-_0-9 / :.] *（JP $克| PNG | GIF）$。）＆＃34;

 <com.andreabaccega.widget.FormEditText
            customValidation:testType="regexp"
            customValidation:customRegexp="^((?!mailto:)(?:(?:https?|ftp)://)?(?:\S+(?::\S*)?@)?(?:(?:(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(?:(?:[a-z\u00a1-\uffff0-9]+-?)*[a-z\u00a1-\uffff0-9]+)(?:\.(?:[a-z\u00a1-\uffff0-9]+-?)*[a-z\u00a1-\uffff0-9]+)*(?:\.(?:[a-z\u00a1-\uffff]{2,})))|localhost))(?::\d{2,5})?(?:/(?:[^\s/]*/)*)([^/]+\.(?:jpe?g|png|gif))$"
            customValidation:emptyAllowed="true"
            customValidation:testErrorString="This is not a valid URL"
            android:id="@+id/edit_imgpath_entry"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:inputType="textMultiLine"
            android:gravity="top"
            android:minLines="1"
            android:layout_weight="1" />

我理解正则表达式的大多数基础知识但我不确定如何扩展它以接受更复杂的情况。

感谢任何帮助！

Answer 1

您需要在图像之前进行某种类型的URL验证。

我猜你可以用这个

做到这一点

\ x {}表示法：^((?!mailto:)(?:(?:https?|ftp)://)?(?:\S+(?::\S*)?@)?(?:(?:(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(?:(?:[a-z\x{a1}-\x{ffff}0-9]+-?)*[a-z\x{a1}-\x{ffff}0-9]+)(?:\.(?:[a-z\x{a1}-\x{ffff}0-9]+-?)*[a-z\x{a1}-\x{ffff}0-9]+)*(?:\.(?:[a-z\x{a1}-\x{ffff}]{2,})))|localhost))(?::\d{2,5})?(?:/(?:[^\s/]*/)*)([^/]+\.(?:jpe?g|png|gif))$

“”弦乐："^((?!mailto:)(?:(?:https?|ftp)://)?(?:\\S+(?::\\S*)?@)?(?:(?:(?:[1-9]\\d?|1\\d\\d|2[01]\\d|22[0-3])(?:\\.(?:1?\\d{1,2}|2[0-4]\\d|25[0-5])){2}(?:\\.(?:[1-9]\\d?|1\\d\\d|2[0-4]\\d|25[0-4]))|(?:(?:[a-z\\x{a1}-\\x{ffff}0-9]+-?)*[a-z\\x{a1}-\\x{ffff}0-9]+)(?:\\.(?:[a-z\\x{a1}-\\x{ffff}0-9]+-?)*[a-z\\x{a1}-\\x{ffff}0-9]+)*(?:\\.(?:[a-z\\x{a1}-\\x{ffff}]{2,})))|localhost))(?::\\d{2,5})?(?:/(?:[^\\s/]*/)*)([^/]+\\.(?:jpe?g|png|gif))$"

\ u表示法：^((?!mailto:)(?:(?:https?|ftp)://)?(?:\S+(?::\S*)?@)?(?:(?:(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(?:(?:[a-z\u00a1-\uffff0-9]+-?)*[a-z\u00a1-\uffff0-9]+)(?:\.(?:[a-z\u00a1-\uffff0-9]+-?)*[a-z\u00a1-\uffff0-9]+)*(?:\.(?:[a-z\u00a1-\uffff]{2,})))|localhost))(?::\d{2,5})?(?:/(?:[^\s/]*/)*)([^/]+\.(?:jpe?g|png|gif))$

“”弦乐："^((?!mailto:)(?:(?:https?|ftp)://)?(?:\\S+(?::\\S*)?@)?(?:(?:(?:[1-9]\\d?|1\\d\\d|2[01]\\d|22[0-3])(?:\\.(?:1?\\d{1,2}|2[0-4]\\d|25[0-5])){2}(?:\\.(?:[1-9]\\d?|1\\d\\d|2[0-4]\\d|25[0-4]))|(?:(?:[a-z\\u00a1-\\uffff0-9]+-?)*[a-z\\u00a1-\\uffff0-9]+)(?:\\.(?:[a-z\\u00a1-\\uffff0-9]+-?)*[a-z\\u00a1-\\uffff0-9]+)*(?:\\.(?:[a-z\\u00a1-\\uffff]{2,})))|localhost))(?::\\d{2,5})?(?:/(?:[^\\s/]*/)*)([^/]+\\.(?:jpe?g|png|gif))$"

格式化 - 可读版本：

 ^ 
 (                             # (1 start), Domain
      (?! mailto: )
      (?:
           (?: https? | ftp )
           ://
      )?
      (?:
           \S+ 
           (?: : \S* )?
           @
      )?
      (?:
           (?:
                (?:
                     [1-9] \d? 
                  |  1 \d\d 
                  |  2 [01] \d 
                  |  22 [0-3] 
                )
                (?:
                     \.
                     (?: 1? \d{1,2} | 2 [0-4] \d | 25 [0-5] )
                ){2}
                (?:
                     \.
                     (?:
                          [1-9] \d? 
                       |  1 \d\d 
                       |  2 [0-4] \d 
                       |  25 [0-4] 
                     )
                )
             |  (?:
                     (?: [a-z\x{a1}-\x{ffff}0-9]+ -? )*
                     [a-z\x{a1}-\x{ffff}0-9]+ 
                )
                (?:
                     \.
                     (?: [a-z\x{a1}-\x{ffff}0-9]+ -? )*
                     [a-z\x{a1}-\x{ffff}0-9]+ 
                )*
                (?:
                     \.
                     (?: [a-z\x{a1}-\x{ffff}]{2,} )
                )
           )
        |  localhost
      )
 )                             # (1 end)
 (?: : \d{2,5} )?
 (?:                           # Directory's
      / 
      (?: [^\s/]* / )*
 )
 (                             # (2 start), The image
      [^/]+ \.
      (?: jpe?g | png | gif )
 )                             # (2 end)
 $

示例输出：

 **  Grp 0 -  ( pos 0 : len 90 ) 
https://upload.wikimedia.org/wikipedia/commons/2/23/The_river_effect_in_justified_text.jpg  
 **  Grp 1 -  ( pos 0 : len 28 ) 
https://upload.wikimedia.org  
 **  Grp 2 -  ( pos 52 : len 38 ) 
The_river_effect_in_justified_text.jpg

如何修复正则表达式以验证具有多个句点的图像链接

1 个答案: