正則表達式，發現模式之前的10個字符

Question

我不擅長正則表達式，所以我需要一些幫助。

我試圖找到如何獲得例如10個字符之前的模式和10個字符之後。 像：

dskjgh kdsfhgl:ks;dhfl\kgh.sldfgdfgsd<pattern1.fso[wpe;x,/c,zasdfsdg 


(10 chars before pattern1) var1 = "ldfgdfgsd<" 
(10 chars after pattern1) var2 = ".fso[wpe;x" 

Answer 1

$str = "dskjgh kdsfhgl:ks;dhfl\\kgh.sldfgdfgsd<pattern1.fso[wpe;x,/c,zasdfsd"; 
preg_match("/(.{10})(pattern1)(.{10})/", $str, $matches); 

$var1 = $matches[1]; 
echo $var1; 

$var2 = $matches[3]; 
echo $var2; 

Answer 2

這應該做的伎倆：

var str = "lasdjfl askjdfl askjdf kljlajpattern1lakjsdflajsdlfkj"; 
var match = str.match(/(.{10})pattern1(.{10})/i); 
var text1 = match[1]; 
var text2 = match[2]; 
alert(text1); 
alert(text2); 

結果：

text1 = jdf kljlaj 

text2 = lakjsdflaj