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HTML Pages with CSS and JavaScript

Stumped: JavaScript match method regular expression

Greenhorn

Posts: 16

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posted 1 month ago

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With this string "x | AAA BBB cc dddd ... |", where between the vertical pipes is an arbitrary combination of characters and spaces, I tried

match(/\|[\/S ]+?\|/), which did not, and should not, match.

But then I tried

match(/\|[\/S ]+\|/) which did not match, much to my surprise, given the greedy nature of the + quantifier.

So then I tried

match(/\|[\/S ]+(?=\|)/), which did not match either.

Thanks in advance for any insight you can provide.

Master Rancher

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posted 1 month ago

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Can you describe in words what you expect

[\/S ]

to mean?

To me, it looks like a character class that includes the characters '/' (unnecessarily escaped), 'S', and ' '. I don't see any reason to expect why that would work here.

Perhaps you're trying to use \S to indicate a non-whitespace character? That wouldn't work inside a character class marked with [ ]. Maybe try

match(/\|(\S| )*?\|/)

Marshal

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posted 1 month ago

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Maybe /\|[^|]+\|/

I tried it in Chrome's dev mode console and it seems to work

Stephan van Hulst

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posted 1 month ago

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Ron McLeod wrote:'x | AAA BBB cc dddd ... |'.match(regex) ? 'match' : 'no match'; 'match'

As a side note, I think this is a wonderful example of how JavaScript's weak type system compounds with the poorly named "match" method to lead to a truly surprising result.

John La

Greenhorn

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posted 1 month ago

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Thanks all for providing clarity. I had at least two competing mistakes preventing the solution to my problem, slash-backslash being one of them. Needless to say, I've got a re-occurring problem with substr-substring methods too.

It's like learning a non-specific foreign language: it's simple, not necessarily easy.

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