javascript - Regex for finding a specific pattern in a string -

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I want to write a regex if a string has ]] [[. For pre: [[T]] [[T]] .

But if I try to use the pattern: 

  RegExp (/] \] \ [? = \ [\ [] /)   
 for testing  [[t]] [[t]] , console displays unknown ')':    < P> 
 
 Why do you have a syntax error:  
 You can call  ( to  \ ( , so you have  unmatched '' ''  in the error  \ (? = \ [\ []   
 How to fix it:  
 The best way to do this really depends on you.  
 If you just want to check that In the string, ]] [[[/ code>, do not use a regex:  
  if (yourString.indexOf (')] [[' ']] == -1 ) {// do something}   
 If you really want to use a regex, you can  [ s but ] to avoid  s:  
  if (/ $] <<< =. Test ((its string)) {// do something}   
 If you really Want to use regex and  [[:  
  do not want to capture, then (/]] (? = \ [\ [] / Test (yourString)) {// do something}   
 If you select  [[ and ]]  (like  [[ T]] ):  
  if (/ \ [[[[[[[[\\]] *]] /. Test (your string)} {// do something}   
 If you want to check two  [[..]]  string back-to-back:  
  if (/ [SA [[[^ [\]] *]] / test (your string)} {// do something}   
 If you have a  If you want to check for [[.. ..]]  string, then  after the exact same string  ( [[t]] [[t]]  but not  [[foo]] [[bar]] ):  
  if (/ ([[[[[^ [[]] *]]) \ 1 / .test (yourS Tring) together with a group of unit tests to show how each of them does the work

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