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Editorial Team
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Asked: 2026-05-23T15:05:27+00:00

I try to check a index string (e.g. $string = [index] ) with a

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I try to check a index string (e.g. $string = "[index]") with a regular expression. This index must be checked against the illegal characters [ and ] inside the index name. So for example [in[dex] must fail.

My first try:

/^\[[^\[\]]*\]$/

So the the string must start and end with [ and ]. With a negated character class I now try to make inline square brackets illegal but this doesn’t work propably.

Any ideas?

Thanks in advanced,
Johnny

Edit: I’m very confused. I rerun the tests I wrote for this and it works fine now. Think I have missed something when working in the history of my editor. Thanks for help to everyone.

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1 Answer

  1. Editorial Team

    This /^\[[^[\]]+\]$/ worked for me.

    /^\[[^[\]]+\]$/.test("[index]") // true
/^\[[^[\]]+\]$/.test("[in[dex]") // false
/^\[[^[\]]+\]$/.test("[in]dex]") // false
    1. /^\[ begins with a bracket
    2. [^ open “not” syntax
    3. [\] exclusion characters
    4. ]+ close not and say we only want 1+ things which pass the not syntax (change to asterisk to match [])
    5. \]$/ Expression will end with the closing bracket.
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