Regular expressions: grab part of string

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So I got the following input inside my textarea element:


what's up?

I want to separate the text between the <quote> and </quote> ( so the result would be 'hey' and nothing else in this case.

I tried with .replace and the following regular expression, but it did not achieve the right result and I can't see why:

quoteContent = value.replace(/<quote>|<\/quote>.*/gi, ''); (the result is 'hey what's up'it doesn't remove the last part, in this case 'what's up', it only removes the quote marks)

Does someone know how to solve this?

You could also try using the match method:

quoteContent = value.match(/<quote>(.+)<\/quote>/)[1];

Regular Expression to extract part of string, If quotes are correctly balanced and quoted strings don't span multiple lines, then you can simply look ahead in the string to check whether an  Fundamentally, regular expressions are a means of flexible pattern matching in strings. If you frequently use the command-line, you are probably familiar with this type of flexible matching with the " * " character, which acts as a wildcard.

Even if it's only a small html snippet, don't use regex to do any html parsing. Instead, take the value, use DOM methods and extract the text from an element. A bit more code, but the better and safer way to do that:

const el = document.getElementById('foo');
const tmp = document.createElement('template');
tmp.innerHTML = el.value;
<textarea id="foo">

what's up?

1.8. Extracting Parts of a String That Match Patterns - Scala , Define the regular-expression patterns you want to extract, placing parentheses around them so you can extract them as “regular-expression groups.” First  The double-slashed and triple-slashed notations for regular expressions and replacement texts in Perl support all the features of double-quoted strings. Most obvious is variable interpolation. You can insert the text matched by the regex or capturing groups simply by using the regex-related variables in your replacement text.

You should try to avoid parsing HTML using regular expressions.

<quote><!-- parsing HTML is hard when </quote> can appear in a comment -->hey</quote>

You can just use the DOM to do it for you.

// Parse your fragment
let doc = new DOMParser().parseFromString(
    '<quote>hey</quote>\nWhat\'s up?', 'text/html')
// Use DOM lookup to find a <quote> element and get its
// text content.
let { textContent } = doc.getElementsByTagName('quote')[0]
// We get plain text and don't need to worry about "&lt;"s
textContent === 'hey'

Regular Expression Syntax Reference, (2) to find a substring which matches certain pattern, from a whole text. When regular expression matches a string, a common character can match the same  So regular expressions are something that I've always struggled a bit with / never spent the due time learning. In this case, I have an R vector of strings with baseball data in this format: hit_v

The dot . will not match new lines.

Try this:

//(.|\n)* will match anything OR a line break
quoteContent = value.replace(/<quote>|<\/quote>(.|\n)*/gi, '');

Regex to Test The Same Part of The String for More Than One , Let's say we want to find a word that is six letters long and contains the three consecutive letters cat. Actually, we can match this without lookaround. We just specify  Repeating a Capturing Group vs. Capturing a Repeated Group. When creating a regular expression that needs a capturing group to grab part of the text matched, a common mistake is to repeat the capturing group instead of capturing a repeated group. The difference is that the repeated capturing group will capture only the last iteration, while a group capturing another group that’s repeated will capture all iterations.

Find Substring within a string that begins and ends , Find Substring within a string that begins and ends with paranthesis. Comments. Post Posting GuidelinesFormatting. - Now. Top Regular Expressions. Match  Last week one of my colleague asked me if I could help him with some Regular Expression (Regex) to select some text inside a String. I don’t work a lot with RegEx but when I do, I use tools like PowerRegex from Sapien, RegExr ,the technet help for about_Regular_Expressions or And to be honest, most of the time I’m trying to

Regex tutorial, Regular expressions (regex or regexp) are extremely useful in extracting abc* matches a string that has ab followed by zero or more c -> Try it!abc+ matches a d only if is followed by r, but r will not be part of the overall regex match -> Try it! Regular expressions (regex) match and parse text. The regex language is a powerful shorthand for describing patterns. Powershell makes use of regular expressions in several ways. Sometimes it is easy to forget that these commands are using regex becuase it is so tightly integrated. You may already be using some

Regular Expression Extracting Matches, Perl makes it easy for you to extract parts of the string that match by using parentheses () around any data in the regular expression. For each set of capturing  The abbreviation for regular expression is regex . The search pattern can be anything from a simple character, a fixed string or a complex expression containing special characters describing the pattern. The pattern defined by the regex may match one or several times or not at all for a given string.

  • /(?<=<quote>).*?(?=<\/quote>)/.exec(yourString)
  • in ESNext, with the s mode. Before that, use [\s\S] or similar to match everything.
  • obligatory…
  • you may need the non-greedy modifier: (.*?)
  • Yes, good point. And also probably want to make sure the match is successful before trying to access it. Otherwise it will throw an error.
  • I see, but here it is more some random string I made to create a forum reply instead of an actual element.
  • You're absolutely free to use an regex approach for your html parsing. Just don't wonder if your code breaks later; that's why I posted the correct approach @tilly. Changing the selector in getElementsByTagName is even much easier and more dynamic than the regex selector
  • And don't use .innerHTML on anything other than a <template> element if you don't trust the string. <img onerror=alert(1) src=bogus> will run javascript even if the node is not attached to the document root.
  • Yes! That was it. Thanks everyone for helping
  • Besides recommending parsing HTML with regular expressions, .|\n will not match [\r\u2028\u2029].
  • Never use (.|\n)* unless you are using a Lucene regex engine. It is a performance killer.