Tips for utilizing regex to locate words and spaces within a text?

I'm feeling so frustrated and lost right now. Any help you can offer would be greatly appreciated. I am currently dealing with an issue in Katex and Guppy keyboard. My goal is to create a regex that will identify the word matrix, locate the slash that has spaces before and after it, and then replace it with a double slash. However, the problem I am facing is that it keeps selecting all slashes between "matrix".


 \left(\begin{matrix}    \sqrt[ 5  ]{ 6  \phantom{\tiny{!}}}     \   \dfrac{ 55  }{ 66  }       \end{matrix}\right)

I need to work around ignoring instances of \sqrt because the slash does not have spaces on both sides.

My desired outcome looks something like this:

\left(\begin{matrix}    \sqrt[ 5  ]{ 6  \phantom{\tiny{!}}}     \\   \dfrac{ 55  }{ 66  }       \end{matrix}\right)

Below is the code I have been working on which is only partially functioning:

const regex = /matrix(.*?)\\(.*?)matrix/g;
equation = equation.replace(regex, 'matrix$1\\\\$2matrix');

Answer №1

Here is a regex pattern you can use for matching:

({matrix}.*? \\)( .*?(?={matrix}))

When replacing, use: $1\\$2

Check out the RegEx Demo here

Snippet of Code:

var equation = String.raw` \left(\begin{matrix}    \sqrt[ 5  ]{ 6  \phantom{\tiny{!}}}     \   \dfrac{ 55  }{ 66  }       \end{matrix}\right)`;
const re = /({matrix}.*? \\)( .*?(?={matrix}))/g;

equation = equation.replace(re, '$1\\$2'); 

console.log(equation);

Breakdown of the Regex Pattern:

  • ({matrix}.*? \\): Group #1 matches from {matrix} to \
  • ( .*?{matrix}): Group #1 matches from a space to {matrix}
  • In replacement, we insert a \ between the two back-references

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