join- join a list into a string using a separator keys- retrieve list of indices from a hash kill- send a signal to a process or process group last- exit a block prematurely lc- return lower-case version of a string lcfirst- return a string with just the next letter in lower case le...
Perl是一种通用的脚本编程语言,适用于多种任务,包括文本处理、系统管理、网络编程等。它具有强大的正则表达式功能,可以方便地进行字符串匹配和截取。 在Perl中,可以使用正则表达式进行变量的截取。当...
abc=123456conf_string=LMN,J,IP,25101,0,3,1 But instead of matching the numbers separately, I can match the whole expression. The match is in$&, so the first/einterpolates that to25100+10. The second round runs that as Perl, which is addition: $ perl -pe's/\d+\+\d+/$&/gee'...
For example, $1 matches whatever was contained in the first set of parentheses in the previous regular expression. $& The string matched by the last successful pattern match. $MATCH $` The string preceding whatever was matched by the last successful pattern match. $PREMATCH $' The string ...
If used in a numeric context, yields the current value of theerrnovariable, identifying the last system call error. If used in a string context, yields the corresponding system error string. $@ $EVAL_ERROR The Perl syntax error message from the lastevalcommand. ...
Perl 诊断消息 类别含义 (W)警告(可选) (D)反对(可选) (S)严重警告(必需) (F)致命错误(可捕获) (P)你应该从未见过的内部错误(恐慌性的)(可捕获) (X)非常致命的错误(不可捕获) (A)外来错误消息(不是Perl生成的)
$` insert the substring that precedes the match $' insert the substring that follows the match $_ insert the entire input string $*MARK or ${*MARK} insert a control verb name For ${n}, n can be a name or a number. If PCRE2_SUBSTITUTE_EXTENDED is set, there is additional interpretat...
$MATCH $& The string matched by the last successful pattern match (not counting any matches hidden within a BLOCK or eval() enclosed by the current BLOCK). (Mnemonic: like & in some editors.) This variable is read-only and dynamically scoped to the current BLOCK. perl v5.12.5 Last ...
$INPLACE_EDIT $INPUT_LINE_NUMBER $INPUT_LINE_NUMBER $INPUT_RECORD_SEPARATOR $INPUT_RECORD_SEPARATOR Chomp and $/, the Input Record Separator How to replace a string in a file with Perl slurp mode - reading a file in one step $LAST_PAREN_MATCH $LAST_PAREN_MATCH $LAST_REG...
Minimum length of string (measured in bytes from"stringarg") that must match; if the engine reaches the end of the match but hasn't reached this position in the string, it should fail. data Optimisation data; subject to change. flags ...