true if the String contains the search character, false if not or null string input 判断是否包含另外的子串 org.apache.commons.lang.StringUtils contains方法 写道 public static boolean contains(String str, String searchStr) Checks if String contains a search String, handling null. This method uses ...
#Take the main string read-p"Enter the main string value: "strValue #Check if the string contains any character from a to e or not if[[$strValue=~[a-e]]];then echo"The string contains characters from 'a' to 'e'" else echo"The string does not contain any character from 'a' to...
这很棒,因为它非常兼容.但是有一个错误:如果haystack字符串为空,它就不起作用.正确的版本是`string_contains(){[ - z"$ {2 ##*$ 1*}"] && [-n"$ 2"-o -z"$ 1"]; 最后的想法:空字符串是否包含空字符串?上面的版本是肯定的(因为`-o -z"$ 1"`部分). (5认同) +1.很好!对我来说,我...
如果if结构使用的不是test命令,而是普通命令,比如上一节的((...))算术运算,或者test命令与普通命令混用,那么可以使用 Bash 的命令控制操作符&&(AND)和||(OR),进行多个命令的逻辑运算。$ command1 && command2 $ command1 || command2对于&&操作符,先执行command1,只有command1执行成功后, 才会执行command2。
If you want to match a character that’s special to the regular expression grammar, it has to be quoted to remove its special meaning. This means that in the pattern ‘xxx.txt’, the ‘.’ matches any character in the string (its usual regular expression meaning), but in the pattern ...
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. Using Wildcards The easiest approach is to surround the substring ...
In contrast, the -z checks if the mentioned string operand size is zero; it returns true if it is zero length. So [ $mobile_missing ] is equivalent to [ -n $mobile_missing ]. As long as $mobile_missing contains at least one character, it was evaluated as true. The expression was...
If you wanttomatchacharacterthat’s specialtothe regular expression grammar, it hastobe quotedtoremove its special meaning. This means thatinthepattern‘xxx.txt’, the ‘.’matchesanycharacterinthe string (its usual regular expression meaning), butinthepattern‘"xxx.txt"’ it canonlymatcha litera...
printf '%s' to prevent printf from expanding backslash escapes: Bash printf literal verbatim string grep -q prevents echo of matches to stdout: How to check if a file contains a specific string using Bash grep -E enables extended regular expressions, which we need for the ^ Share Impr...
! if (command->value.Coproc->command->type != cm_simple) ! cprintf ("%s ", command->value.Coproc->name); skip_this_indent++; make_command_string_internal (command->value.Coproc->command); *** ../bash-5.2/patchlevel.h 2020-06-22 14:51:03.000000000 -0400 --- patchlevel.h 2020...