Matching a string that starts with a specific character

I am trying to get some Regex to match and string that begins with ~ and ends with a space or the end of the line.

It's part of a Wiki Converter I'm cobbling together... I need to wrap anything that starts in ~ upto the next space (or EOL) in tags.

Example strings are:

"~Test"          // matches Test
"~----"          // matches ----
"~Test Bob"      // match开发者_运维问答es Test
"~Test, Bob"     // matches Test,
"Some ~Test Bob" // matches Test
"Some ~Test"     // matches Test

Thanks

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(?<=~)[^\s]+

Read as "look behind for a tilde, then match anything after that except for whitespace."

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(?<=~)\S+

Same as the other answer, but better match for non-whitespace.
Or, simpler,

~(\S+)

If you are using group anyway