JavaScript Regex Multiline Text Between Two Tags

How to capture multiline regex between two tags?

Depending on your underlying engine use the s-modifier (and add --> at the end of your expression.

This will make the . match newline-characters aswell.

If the s-flag is not available to you, you may use

<!--((?:.*\r?\n?)*)-->

Explanation:

<!--         #start of comment
  (           #start of capturing group
    (?:       #start of non-capturing group
      .*\r?\n? #match every character including a line-break
    )*        #end of non-capturing group, repeated between zero and unlimited times
  )           #end of capturing group
-->           #end of comment

To match multiple comment blocks you can use

/(?:<!--((?:.*?\r?\n?)*)-->)+/g

Demo @ Regex101

Regex capture everything between two tags across multiple lines

Javascript does not support multiline expressions when using . alone. You have to use [\s\S] in place of . so an example that satisfies what you want would be:

var x = "<sometag>\n\
  123\n\
  456\n\
</sometag>";

var ans = x.match(/<sometag>([\s\S]*?)<\/sometag>/im).pop();

// ans equals " 123  456"

note that you still need the m modifier.

JavaScript regex multiline text between two tags

You are looking for the /.../s modifier, also known as the dotall modifier. It forces the dot . to also match newlines, which it does not do by default.

The bad news is that it does not exist in JavaScript (it does as of ES2018, see below). The good news is that you can work around it by using a character class (e.g. \s) and its negation (\S) together, like this:

[\s\S]

So in your case the regex would become:

/<div class="box-content-5">[\s\S]*<h1>([^<]+?)<\/h1>/i

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As of ES2018, JavaScript supports the s (dotAll) flag, so in a modern environment your regular expression could be as you wrote it, but with an s flag at the end (rather than m; m changes how ^ and $ work, not .):

/<div class="box-content-5">.*<h1>([^<]+?)<\/h1>/is

Regex multiple lines and capture specific text between

You can use

Register(?:[^\r\n]*\r?\n){2}([^\r\n]+(?:\r?\n[^\r\n]+)*)

Details:

• Register - a fixed string
• (?:[^\r\n]*\r?\n){2} - two sequences of zero or more chars other than CR and LF and then an optional CR followed with one LF char
• ([^\r\n]+(?:\r?\n[^\r\n]+)*) - Group 1:
  
  • [^\r\n]+ - one or more chars other than CRLF
  • (?:\r?\n[^\r\n]+)* - zero or more repetitions of CLRF or LF line ending sequence and then one or more chars other than CR and LF.

How to match all text between two strings multiline

Well unfortunately, RegExr is dependent on the JS RegExp implementation, which does not support the option to enable the flag/modifier that you need.

You are looking for the s (DotAll) modifier forcing the dot . to match newline sequences.

• Live Demo on regular expressions 101

If you are using JavaScript, you can use this workaround:

/<!-- OPTIONAL -->([\S\s]*?)<!-- OPTIONAL END -->/

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