escaping question mark in regex javascript

Question

This is a simple question I think   I am trying to search for the occurrence of a string in another string using regex in JavaScript like so    var content   Hi  I like your Apartment  Could we schedule a viewing  My phone number is       var gent   new RegExp  I like your Apartment  Could we schedule a viewing  My    g      if content search gent     -1           alert  worked                        This doesn t work because of the   character    I tried escaping it with    but that doesn t work either  Is there another way to use   literally instead of as a special character

User · Accepted Answer

You need to escape it with two backslashes         See this for more details   http   www trans4mind com personal development JavaScript Regular 20Expressions 20Simple 20Usage htm

User · Answer

Whenever you have a known pattern  i e  you do not use a variable to build a RegExp   use literal regex notation where you only need to use single backslashes to escape special regex metacharacters  var re    I like your Apartment   Could we schedule a viewing   g                                                                   Whenever you need to build a RegExp dynamically  use RegExp constructor notation where you MUST double backslashes for them to denote a literal backslash  var questionmark block    quot     quot      A literal   var initial subpattern    quot I like your Apartment    Could we schedule a viewing quot      Note the dot must also be escaped to match a literal dot var re   new RegExp initial subpattern   questionmark block   quot g quot     And if you use the String raw string literal you may use   as is  see an example of using a template string literal where you may put variables into the regex pattern    x000D   x000D  const questionmark block   String raw         A literal   const initial subpattern    I like your Apartment    Could we schedule a viewing   const re   new RegExp    initial subpattern   questionmark block     g       Building pattern from two variables console log re        gt   I like your Apartment   Could we schedule a viewing   g x000D   x000D   x000D   A must-read  RegExp  Description at MDN

User · Answer

You should use double slash   var regex   new RegExp         g      Why  because in JavaScript the   is also used to escape characters in strings   so       becomes       And        becomes

User · Answer

You can delimit your regexp with slashes instead of quotes and then a single backslash to escape the question mark  Try this   var gent    I like your Apartment  Could we schedule a viewing   g

[javascript] escaping question mark in regex javascript

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