Regex to replace function in string

Question

I have a string

Apply the function K(i, x<=>k) for more info.

I want to convert K(i, x<=>k) to K_{i}(x<>k), but the arguments inside the function K can vary, so I guess it is something like

string.replace(/\K\([.?],[.?]\)/g, 'K_{$1}($2)')

Edit

Sorry for the vague explanation of what the arguments for K can be. I just thought the regex would be faster if it didn't specify what the arguments could be, but just had some placeholders.

The first argument of K can be only be numbers and letters and the second argument of K can be numbers, letters, spaces, ->, <->, [], <>, &, | and ~, and there can never be more than 2 arguments, so the pattern is always K(something, something).

The remaining string varies as well. So a string could also look like I have a function K(i,a) and two other functions K(3,p&s |r) and K(f, ~g)

Please give more examples if you want a regex that matches multiple cases. — James Monger
– James Monger, Commented Oct 10, 2016 at 14:51
"arguments can vary" ... that's pretty vague to be able to write a regex against — charlietfl
– charlietfl, Commented Oct 10, 2016 at 14:52
is the rest of the string always the same or does that vary too? — I wrestled a bear once.
– I wrestled a bear once., Commented Oct 10, 2016 at 14:54

score 2 · Accepted Answer · 2016-10-10 15:09:58Z

2

May be something like that (you forgot to group args for the replace value):

string.replace(/K$([a-zA-Z0-9]+), ?(.+)$/g, 'K_{$1}($2)')

edited Oct 10, 2016 at 15:09

answered Oct 10, 2016 at 15:03

user6083184

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