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 ]]

[[email protected] ~]# STR=hello.gif

[[email protected] ~]# SUFFIX=.gif

[[email protected] ~]# [[ $STR == *$SUFFIX ]] && echo "ends"

ends

[[email protected] ~]# 

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。

[[email protected] ~]# STR=hello.gif

[[email protected] ~]# SUFFIX=.gif

[[email protected] ~]# [[ $STR =~ $SUFFIX$ ]] && echo "ends"

ends

[[email protected] ~]# 

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：

[[email protected] ~]# STR=helloxgif

[[email protected] ~]# SUFFIX=.gif

[[email protected] ~]# [[ $STR =~ $SUFFIX$ ]] && echo "ends"

ends

[[email protected] ~]#

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。

[[email protected] ~]# STR=hello.gif

[[email protected] ~]# SUFFIX=.gif

[[email protected] ~]# case "$STR" in *"$SUFFIX") echo "ends"; esac

ends

[[email protected] ~]# case "$STR" in "*$SUFFIX") echo "ends"; esac

[[email protected] ~]#

用去尾法判断是否以别的字符串结尾

格式：[ "${STR%$SUFFIX}" != "$STR" ]

[[email protected] ~]# STR=hello.gif

[[email protected] ~]# SUFFIX=.gif

[[email protected] ~]# [ "${STR%$SUFFIX}" != "$STR" ] && echo "ends"

ends

[[email protected] ~]#

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

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