Bash字符串处理（与Java对照） - 17.判断是否以另外的字符串结尾

In Java

String.endsWith

oolean     endsWith(String suffix)
          测试此字符串是否以指定的后缀结束。

 

StringUtils.endsWith & StringUtils.endsWithIgnoreCase & StringUtils.endsWithAny

org.apache.commons.lang.StringUtils endsWith方法 写道

public static boolean endsWith(String str, String suffix)

Check if a String ends with a specified suffix.

nulls are handled without exceptions. Two null references are considered to be equal. The comparison is case sensitive.

StringUtils.endsWith(null, null) = true
StringUtils.endsWith(null, "def") = false
StringUtils.endsWith("abcdef", null) = false
StringUtils.endsWith("abcdef", "def") = true
StringUtils.endsWith("ABCDEF", "def") = false
StringUtils.endsWith("ABCDEF", "cde") = false


Parameters:
str - the String to check, may be null
suffix - the suffix to find, may be null
Returns:
true if the String ends with the suffix, case sensitive, or both null

 

org.apache.commons.lang.StringUtils endsWithIgnoreCase方法 写道

public static boolean endsWithIgnoreCase(String str, String suffix)

Case insensitive check if a String ends with a specified suffix.

nulls are handled without exceptions. Two null references are considered to be equal. The comparison is case insensitive.

StringUtils.endsWithIgnoreCase(null, null) = true
StringUtils.endsWithIgnoreCase(null, "def") = false
StringUtils.endsWithIgnoreCase("abcdef", null) = false
StringUtils.endsWithIgnoreCase("abcdef", "def") = true
StringUtils.endsWithIgnoreCase("ABCDEF", "def") = true
StringUtils.endsWithIgnoreCase("ABCDEF", "cde") = false


Parameters:
str - the String to check, may be null
suffix - the suffix to find, may be null
Returns:
true if the String ends with the suffix, case insensitive, or both null

 

org.apache.commons.lang.StringUtils endsWithAny方法 写道

public static boolean endsWithAny(String string, String[] searchStrings)

Check if a String ends with any of an array of specified strings.

StringUtils.endsWithAny(null, null) = false
StringUtils.endsWithAny(null, new String[] {"abc"}) = false
StringUtils.endsWithAny("abcxyz", null) = false
StringUtils.endsWithAny("abcxyz", new String[] {""}) = true
StringUtils.endsWithAny("abcxyz", new String[] {"xyz"}) = true
StringUtils.endsWithAny("abcxyz", new String[] {null, "xyz", "abc"}) = true


Parameters:
string - the String to check, may be null
searchStrings - the Strings to find, may be null or empty
Returns:
true if the String ends with any of the the prefixes, case insensitive, or both null

 

In Bash

使用[[ ]] 模式匹配来判断是否以别的字符串结尾（推荐方式）

格式：[[ $STR == *$SUFFIX ]]

 

[root@web ~]# STR=hello.gif
[root@web ~]# SUFFIX=.gif
[root@web ~]# [[ $STR == *$SUFFIX ]] && echo "ends"
ends
[root@web ~]# 

 

使用[[ ]] 正则表达式匹配来判断是否以别的字符串结尾

格式：[[ $STR =~ $SUFFIX$ ]]

在正则表达式中，$匹配结尾。

 

[root@web ~]# STR=hello.gif
[root@web ~]# SUFFIX=.gif
[root@web ~]# [[ $STR =~ $SUFFIX$ ]] && echo "ends"
ends
[root@web ~]# 

 

例外：在上面的例子中，SUFFIX中包含点(.)，而点(.)在正则表达式中能够匹配任意字符，如下所示：

[root@web ~]# STR=helloxgif
[root@web ~]# SUFFIX=.gif
[root@web ~]# [[ $STR =~ $SUFFIX$ ]] && echo "ends"
ends
[root@web ~]#

 

用case语句来判断是否以别的字符串结尾

正确：case "$STR" in *"$SUFFIX") echo "ends"; esac

错误：case "$STR" in "*$SUFFIX") echo "ends"; esac

注意*不能写在双引号里面，否则不灵。

 

 

[root@web ~]# STR=hello.gif
[root@web ~]# SUFFIX=.gif
[root@web ~]# case "$STR" in *"$SUFFIX") echo "ends"; esac
ends
[root@web ~]# case "$STR" in "*$SUFFIX") echo "ends"; esac
[root@web ~]#

 

用去尾法判断是否以别的字符串结尾

格式：[ "${STR%$SUFFIX}" != "$STR" ]

 

[root@web ~]# STR=hello.gif
[root@web ~]# SUFFIX=.gif
[root@web ~]# [ "${STR%$SUFFIX}" != "$STR" ] && echo "ends"
ends
[root@web ~]#

 

 

本文链接：http://codingstandards.iteye.com/blog/1187353   （转载请注明出处）

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