JS Regex用于匹配特定的数组增量，而忽略字符串和单独的增量

Question

I have the following input fields with name attributes of:

carousels['components'][0][0][title]
carousels['components'][0][1][title]
carousels['components'][0][2][title]

carousels['components'][1][0][title]
carousels['components'][1][1][title]
carousels['components'][1][2][title]

carousels['components'][2][0][title]
carousels['components'][2][1][title]
carousels['components'][2][2][title]

I am trying to match the final [ number ] eg this part:

carousels['components'][2][THIS][title]
carousels['components'][2][THIS][title]
carousels['components'][2][THIS][title]

While ignoring the rest

Here is my regex pattern:

/(\[[^components\]])+(\[*])/

This affects both of the int's within brackets when I just want the last one. This regex also doesn't recognize the specific requirement of the first array key 'component'

Live regex test here:

http://www.regexpal.com/?fam=94974

Answer 1

You can try this

    ^.*(\[.*?\])\[.*?\]$
       <------->
Match in this(1st captured group)

Regex Demo

If you want to match ['components'] exclusively, then you can use

^.*\['components'\].*(\[.*?\])\[.*?\]$

Answer 2

If you want to get the last [ + digits + ] , you can use

/^.*\[(\d+)\].*$/

See the regex demo

Backtracking will help getting exactly the last occurrence of [digits] . Grab Group 1 value.

 var re = /^.*\\[(\\d+)\\].*$/; var str = 'carousels[\\'components\\'][0][0][title]\\ncarousels[\\'components\\'][0][1][title]\\ncarousels[\\'components\\'][0][2][title]\\n\\ncarousels[\\'components\\'][1][0][title]\\ncarousels[\\'components\\'][1][1][title]\\ncarousels[\\'components\\'][1][2][title]\\n\\ncarousels[\\'components\\'][2][0][title]\\ncarousels[\\'components\\'][2][1][title]\\ncarousels[\\'components\\'][2][2][title]'; for (var s of str.split("\\n")) { var res = (m=re.exec(s)) ? m[1] : ""; if (res) { document.body.innerHTML += s + ": " + res + "<br/>"; } } 

UPDATE :

To get the first [ + digits + ] , you need to use lazy matching with the first dot:

/^.*?\[(\d+)\].*$/
    ^ - Here, the ? will make matching lazy/reluctant 
        (it will match any 0+ chars other than a newline as few as possible)

See another regex demo .