Question 52814 in Javascript Question posted in
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Regex – Match all charactes between curly braces as long as certain string is present – Javascript

I have paragraphs like this:

"{~1.6} This is another paragraph {~1} with curly braces.{~6.8}"

I want to match {~<int or float>}

So far I’ve came to this regex: /{(~(d*.?d+),?)}/g

It works just fine but sometimes there will be some other characters before or after ~<int or float> like this:

"{:.class ~1.6 #id} This is another paragraph {~1 .class #id} with curly braces.{:#id ~6.8}"

I don’t know in advance the content before or after ~<int or float>, all that I know is that all the content is between curly braces.

How can I match every {<some content here>} as long as it contains at least one ~<int or float> occurrence?

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4

Answers


  1. 0

    You can try this one

    /{(?=.~(d.?d+))([^{}]+)}/g
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  2. 0

    You can surround your ~number with classes excluding pairing braces, like this:

    {[^}]*(~(d*.?d+),?)[^{]*}

    Example here.

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  3. 0 
    /{([^}]*(~d*(?:.d+)?)[^}]*)}/

    Match the brace, any number of non-brace characters, then the bit you were interested in (tilde and a number, with optional decimal point and decimal digits), then possibly some more non-brace characters, and finally the closing brace. regex101

    Note that a brace does not need to be escaped in JavaScript unless it contains a valid quantifier (number or pair of numbers separated by a comma, possibly with one number missing), though it doesn’t hurt; tilde does not need escaping at all.

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  4. 0

    To remove all characters that are outside of the curly braces, you can use the following regular expression:

    {[^{}]*}

    This pattern will take your example strings and output the following:

    • "{~1.6}{~1}{~6.8}"
    • "{:.class ~1.6 #id}{~1 .class #id}{:#id ~6.8}"

    The pattern above is simpler but you can use this expression if you also need to ignore empty braces, ie {}

    {[^{}]*}(?=[^{}]*{[^{}]*})

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