StringUtils.contains(null, *) = false StringUtils.contains(*, null) = false StringUtils.contains("", "") = true StringUtils.contains("abc", "") = true StringUtils.contains("abc", "a") = true StringUtils.contains("abc", "z") = false Parameters: str - the String to check, may be ...
valint() #@ USAGE: valint INTEGER case ${1#-} in ## Leading hyphen removed to accept negative numbers *[!0-9]*) false;; ## the string contains a non-digit character *) true ;; ## the whole number, and nothing but the number esac 如果函数体用括号括起来,那么它是在子 shell ...
it is a good idea to print an indication that there was an error. Ideally, the string of characters should have a substring such as ERROR or something similar (see the statement in bold blue), which will allow the tester to quickly find the error in the output file. This output file...
NSString *result = [[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding]; NSLog(result); NSString *string = result; NSString *substring = @"Caddy 2 serving static files on :2015"; if ([string rangeOfString:substring].location != NSNotFound) { NSLog(@"Yes it does contain...
Check if string contains a sub-stringUsing a test:if [[ $var == *sub_string* ]]; then printf '%s\n' "sub_string is in var." fi # Inverse (substring not in string). if [[ $var != *sub_string* ]]; then printf '%s\n' "sub_string is not in var." fi # This works ...
The substring value provides functionality analo gous to the %? job id (see JOB CONTROL below). If set to any other value, the supplied string must be a prefix of a stopped job's name; this provides functionality analogous to the % job id. no_exit_on_failed_exec If this ...
$substring是一个正则表达式expr "$string" : '$substring' $substring是一个正则表达式 1 stringZ=abcABC123ABCabc 2 # |---| 3 4 echo `expr match "$stringZ" 'abc[A-Z]*.2'` # 8 5 echo `expr "$stringZ" : 'abc[A-Z]*.2'` # 8索引 expr...
If set to the value exact, the string supplied must match the name of a stopped job exactly; if set to substring, the string supplied needs to match a substring of the name of a stopped job. The sub- string value provides functionality analogous to the %? job identifier (see JOB ...
There is no in array operator in bash to check if an array contains a value. Instead, to check if a bash array contains a value you will need to test the values in the array by using a bash conditional expression with the binary operator =~. The string to the right of the operator...
•${string/%substring/substitution}–substitute last occurrence •${string#substring}–erase shortest substring •${string##substring}–erase longest substring 3.2.Embedded variables •~,$HOME–home directory of current user •$PS1,$PS2–primary,secundary user prompt •$PWD,~+/$OLDPWD,~...