How to match capitalized/all-uppercase/all-lowercased word in Regular expression

Question

All:

As title.

How to make word pattern like Hello/HELLO/hello

Thanks

score 1 · Accepted Answer · answered Jan 08 '15 at 22:11

1

You can use this regex:

^([A-Za-z][a-z]*|[A-Z]+)$

answered Jan 08 '15 at 22:11

anubhava

Thanks for quick reply. A basic question about | sign, is it a OR operation between [a-z]* and [A-Z]+, or it operate between [A-Za-z][a-z]* and [A-Z]+ – Kuan Jan 08 '15 at 22:22
`|` is alternation between `[A-Za-z][a-z]*` and `[A-Z]+` – anubhava Jan 08 '15 at 22:24
Could you help me with a not quite related problem: http://stackoverflow.com/questions/27849659/how-to-highlight-all-matched-word-in-single-snippet-in-solr – Kuan Jan 08 '15 at 22:26
So sorry for interrupting. See ya later. – Kuan Jan 08 '15 at 22:30
Looked at your other question, sorry I don't know anything about `solr`. – anubhava Jan 09 '15 at 06:27
Thanks for help. I will just keep searching. – Kuan Jan 09 '15 at 16:47

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