Regular expression on form value

I have a form value that I need to add a regular expression to the end so I can pick up any characters after the form value.
Example if someone enters Jones then I want to make sure the value could also search Jones Jr or Jones Sr.
Basically add a space and any characters a-z to the form value.
Here is my attempt but lost on regular expression part:
REReplace ("form.myvalue","[[:space:]]","Not sure what the regular expression would be here?","ALL")

This will replace "Jones Jr" and "Jones Sr" in the following text:
"this is a test text Jones Jr and Jones Sr"
ReReplaceNoCase("your_text_in_which_you_want_to_replace",
"#form.myvalue#[[:space:]][a-z]*", "replacement_text", "ALL")
Mack

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Message was edited by:
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