Checks if String contains a search String, handling null. This method uses String.indexOf(String). A null String will return false. StringUtils.contains(null, *) = false StringUtils.contains(*, null) = false StringUtils.contains("", "") = true StringUtils.contains("abc", "") = true Str...
If you are familiar with theconditional statements in bash, you can use it to check if a string contains the substring in the following manner: if [[ $fullstring == *"$substr"* ]]; Simple example for checking substring The double brackets are necessary here. I consider this to be the ...
string='My long string' if [[ $string == *"My long"* ]]; then echo "It's there!" fi 请注意,针线中的空格需要放在双引号之间,*通配符应该在外面。 如果您更喜欢正则表达式方法: string='My string'; if [[ $string =~ .*My.* ]] then echo "It's there!" fi ...
我们还可以在if语句中使用通配符从字符串中查找子字符串。查找子字符串的最简单方法是将通配符星号 (*) 放在子字符串周围并将其与实际字符串进行比较。 脚本: #!/bin/bashstr='This is a bash tutorial'substr='tutorial'if[["$str"==*"$substr"*]];thenecho"String contains the sunstring"elseecho"Strin...
/bin/bashstr='This is a bash tutorial'substr='bash'if[["$str"=~ .*"$substr".*]];thenecho"String contains the substring"fi 请注意,在条件语句中,正则表达式运算符使右侧字符串成为正则表达式,符号.*表示比较字符串中出现的 0 次或多次子字符串。
{if[["$1"=~"$2"]];thenecho\"$1\" contains \"$2\"elseecho\"$1\" does not contain \"$2\"fi} check_substr"$1""$2" 这个脚本判断传入的第二个参数是否为第一个参数的子字符串。 具体执行结果如下: $ ./check_substr.sh"This is a test string""test string""This is a test string...
[ STRING1 > STRING2 ] 如果 “STRING1” sorts after “STRING2” lexicographically in the current locale则为真。 [ ARG1 OP ARG2 ] “OP” is one of -eq, -ne, -lt, -le, -gt or -ge. These arithmetic binary operators return true if “ARG1” is equal to, not equal to, less than...
bash中的字符串引用是一件很简单的事情,我们大多数人对此看一眼就能明了,但是今天这个技巧,也许能够帮你在未来节省不少时间。引用符包括 “(双引号)和 ' (单引号),最基本的用法就是引用字符串。...,我们经常遇到问题的地方是在处理文件名中有空格的文件时。...例
One of the most common operations when working with strings in Bash is to determine whether or not a string contains another string. In this article, we will show you several ways to check if a string contains a substring.
If the regular expression is syntactically incorrect, the conditional expression's return value is 2. Any part of the pattern may be quoted to force the quoted portion to be matched as a string. 即,使用 =~ 操作符时,其右边的字符串被认为是一个扩展正则表达式。