Perl 函式 - /PATTERN/

<div style="margin: 0px; padding: 0px; border: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-weight: 400; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: arial, "Century Gothic", 微軟正黑體; vertical-align: baseline; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; color: rgb(68, 68, 68); letter-spacing: 0.8px; background-color: rgb(255, 255, 255);"> <h2 class="ih-heading" style="margin: 0px 0px 25px; padding: 0px; border-width: 0px 0px 2px; border-top-style: initial; border-right-style: initial; border-bottom-style: solid; border-left-style: initial; border-top-color: initial; border-right-color: initial; border-bottom-color: rgb(0, 0, 0); border-left-color: initial; border-image: initial; font-style: inherit; font-variant: inherit; font-weight: 400; font-stretch: inherit; font-size: 2rem; line-height: 1; font-family: inherit; vertical-align: baseline; color: inherit; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial; letter-spacing: 0.7px; background-color: rgb(255, 255, 255); box-sizing: border-box;"> ■ 功 能

樣式比對算符

<div style="margin: 0px; padding: 0px; border: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-weight: 400; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: arial, "Century Gothic", 微軟正黑體; vertical-align: baseline; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; color: rgb(68, 68, 68); letter-spacing: 0.8px; background-color: rgb(255, 255, 255);"> <h2 class="ih-heading" style="margin: 0px 0px 25px; padding: 0px; border-width: 0px 0px 2px; border-top-style: initial; border-right-style: initial; border-bottom-style: solid; border-left-style: initial; border-top-color: initial; border-right-color: initial; border-bottom-color: rgb(0, 0, 0); border-left-color: initial; border-image: initial; font-style: inherit; font-variant: inherit; font-weight: 400; font-stretch: inherit; font-size: 2rem; line-height: 1; font-family: inherit; vertical-align: baseline; color: inherit; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial; letter-spacing: 0.7px; background-color: rgb(255, 255, 255); box-sizing: border-box;"> ■ 語 法

m/PATTERN/gimosx

/PATTERN/gimosx

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<div style="margin: 0px; padding: 0px; border: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-weight: 400; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: arial, "Century Gothic", 微軟正黑體; vertical-align: baseline; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; color: rgb(68, 68, 68); letter-spacing: 0.8px; background-color: rgb(255, 255, 255);"> <h2 class="ih-heading" style="margin: 0px 0px 25px; padding: 0px; border-width: 0px 0px 2px; border-top-style: initial; border-right-style: initial; border-bottom-style: solid; border-left-style: initial; border-top-color: initial; border-right-color: initial; border-bottom-color: rgb(0, 0, 0); border-left-color: initial; border-image: initial; font-style: inherit; font-variant: inherit; font-weight: 400; font-stretch: inherit; font-size: 2rem; line-height: 1; font-family: inherit; vertical-align: baseline; color: inherit; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial; letter-spacing: 0.7px; background-color: rgb(255, 255, 255); box-sizing: border-box;"> ■ 用 法

此算符會在字串中去搜尋某個樣式，並用純量內容傳回true(1)或是false.

若沒有透過 =~ 或 !~ 來指定字串，預設會去搜尋 $_ 字串

修飾字 意義 g 整體比對，找出每個發生的地方 i 進行區別大小寫 m 將字串視為多行 o 樣式只編譯一次 s 將字串視為一行 x 採用延伸的REGEX

① / 是分隔符號時，則開頭的 m 就不是必需的

② m 為開頭時，我們可以使用任何的非字母、數字、字白碼的字元來做分隔符號

③ PATTERN可以包含變數

④ PATTERN若為空字串時，則會採用上一次成功執行，而且不是在內部區塊的REGEX

$& 為匹配的字串

$` 包含匹配之前的字串

$' 它包含了匹配之後的字串

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<div style="margin: 0px; padding: 0px; border: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-weight: 400; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: arial, "Century Gothic", 微軟正黑體; vertical-align: baseline; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; color: rgb(68, 68, 68); letter-spacing: 0.8px; background-color: rgb(255, 255, 255);"> <h2 class="ih-heading" style="margin: 0px 0px 25px; padding: 0px; border-width: 0px 0px 2px; border-top-style: initial; border-right-style: initial; border-bottom-style: solid; border-left-style: initial; border-top-color: initial; border-right-color: initial; border-bottom-color: rgb(0, 0, 0); border-left-color: initial; border-image: initial; font-style: inherit; font-variant: inherit; font-weight: 400; font-stretch: inherit; font-size: 2rem; line-height: 1; font-family: inherit; vertical-align: baseline; color: inherit; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial; letter-spacing: 0.7px; background-color: rgb(255, 255, 255); box-sizing: border-box;"> ■ 範 例

程式碼

<div class="jane_bar" style="margin: auto auto 15px; padding: 15px; border: 0px dotted gray; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-weight: 400; font-stretch: inherit; font-size: 16px; line-height: 20px; font-family: "Microsoft JhengHei", cwTeXHei, "Open Sans"; vertical-align: baseline; color: rgb(40, 40, 40); letter-spacing: 1px; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; border-radius: 0px; width: 100%; background-color: rgb(237, 237, 237); box-sizing: border-box; text-align: left;"> #!/usr/bin/perl -w

$string = "It is as well to know which way the wind blows"; $string =~ m/kno/; print "之前的字串: $`\n"; print "符合的字串: $&\n"; print "之後的字串: $'\n";

結果

<div class="jane_bar" style="margin: auto auto 15px; padding: 15px; border: 0px dotted gray; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-weight: 400; font-stretch: inherit; font-size: 16px; line-height: 20px; font-family: "Microsoft JhengHei", cwTeXHei, "Open Sans"; vertical-align: baseline; color: rgb(40, 40, 40); letter-spacing: 1px; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; border-radius: 0px; width: 100%; background-color: rgb(237, 237, 237); box-sizing: border-box; text-align: left;"> 之前的字串: It is as well to 符合的字串: kno 之後的字串: w which way the wind blows

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＃關鍵字 Perl 函式 - /PATTERN/用法；Perl 函式 - /PATTERN/語法；Perl 函式 - /PATTERN/範例；

<div style="margin: 0px; padding: 0px; border: 0px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-weight: 400; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: arial, "Century Gothic", 微軟正黑體; vertical-align: baseline; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; color: rgb(68, 68, 68); letter-spacing: 0.8px; background-color: rgb(255, 255, 255);"> <h2 class="ih-heading" style="margin: 0px 0px 25px; padding: 0px; border-width: 0px 0px 2px; border-top-style: initial; border-right-style: initial; border-bottom-style: solid; border-left-style: initial; border-top-color: initial; border-right-color: initial; border-bottom-color: rgb(0, 0, 0); border-left-color: initial; border-image: initial; font-style: inherit; font-variant: inherit; font-weight: 400; font-stretch: inherit; font-size: 2rem; line-height: 1; font-family: inherit; vertical-align: baseline; color: inherit; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial; letter-spacing: 0.7px; background-color: rgb(255, 255, 255); box-sizing: border-box;"> ■ Perl 其它函數

▶ Perl 函式|函數|指令集

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