Question 211252 in Javascript Question posted in
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Javascript – Regex doesn't match as i expect

I have this string:
'Slope fields are constructed by plotting tiny line segments at various points in the $xy$-plane. The slope of each line segment is given by the value of $f(x, y)$ at that corresponding point. These line segments collectively form a field of slopes, hence the name "slope field."'

and also this regex: /S*$$?[^$]*$$?S*/gi

which i feel should match all phrases within single or double dollar signs $ as well as any text that surrounds it. so ideally it should math $xy$-plane. and $f(x, y)$

but for some reason it matches: $xy$-plane. The slope of each line segment is given by the value of $f(x,

anyone has any idea what im doing wrong or whats going on here?

I am expecting it to match $xy$-plane. and $f(x, y)$ but it doesn’t

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3

Answers


  1. 0

    Change the regex to /[^s$]*$[^$]+$[^s$]*/gi.
    That matches what you want it to match according to regex101:
    enter image description here

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  2. 0

    You’d want something like:

    [^s$]*$[^$]+$[^s$]*
    • [^s$]* – match zero or more non-whitespace and not dollar sign characters before the opening dollar sign
    • $ – opening dollar sign
    • [^$]+ – one or more not dollar signs
    • $ – closing dollar sign
    • [^s$]* – zero or more non-whitespace and not dollar sign characters

    https://regex101.com/r/ws0mn0/1

    const str = 'Slope fields are constructed by plotting tiny line segments at various points in the $xy$-plane. The slope of each line segment is given by the value of $f(x, y)$ at that corresponding run-on-sentence$()$followed-by-another$DHF$group point. These line segments collectively form a field of slopes, hence the name "slope field." and more some-$yz$-something else';

const match = str.match(/[^s$]*$[^$]+$[^s$]*/g);

console.log(match);
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  3. 0

    Probably you need smth like this

    /S*?$$?[^$]*$$?S*/gi

    That would grab all text inside dollar signs and surrounding text, which is not whitespace.

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