I'm using regex to get the indices of variables accessing pattern represented as string, for example:
string = "test[2][56].var1[4]"
The regex match result in the groups 2, 56, 4 captured.
matchGroups = ["2", "56", "4"]
The regex below works.
\[([^\.\]]+)\]
But I can't allow cases like:
"test.[3].var1"
or
"test[3]/"
I tried to limit the characters allowed before and after each group using the regex below:
[\]a-zA-Z0-9]\[([^\.\]]+)\]([\[a-zA-Z0-9])?
But some cases stopped working like the case "test[0].var7[3][4]"(4 is not captured).
I need help to make this work with all cases again(cases are in the link below).
I would replace the string, then do matching
/.*?\[(\d+)\].*?/
Replace the string where any number between brackets is replaced by a number followed by ,
/\d+(?=,)/
Look ahead positive; which
Find any number followed by ,
const captureNumber = str => str.replace(/.*?\[(\d+)\].*?/g, "$1,").match(/\d+(?=,)/g)
console.log(captureNumber("test[0].var7[3][4]")); //[ "0", "3", "4" ]
console.log(captureNumber("test[3]/")); //[ "3" ]
console.log(captureNumber("test.[3].var1")); //[ "3" ]
console.log(captureNumber("test[2][56].var1[4]")); //[ "2", "56", "4" ]the simplest would be to use a regexp using a positive lookbehind and a positive lookahead. To this, you can add safety on spaces in case you have a case like "test[ 2 ][ 56 ].var1[ 4 ]", to which a .trim() method string must be applied. Here is a snippet illustrating this:
const getIndex = str => str.match(/(?<=\[) *\d+ *(?=\])/g).map(val => val.trim());
console.log(getIndex("test[0].var7[3][4]")); //[ "0", "3", "4" ]
console.log(getIndex("test[3]/")); //[ "3" ]
console.log(getIndex("test.[3].var1")); //[ "3" ]
console.log(getIndex("test[2 ][ 56 ].var1[4 ]")); //[ "2", "56", "4" ]Good luck !