regex - Xpath replace function, processing matches -

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I am writing a function for the "title case" string e.g. "This is a title" for "This is a title." The following line does not work because the regex group reference is lost (either I agree). Is there an easy way to uppercase my matching letter in the replacement function? 

  Replace ($ input, '\ b [az]', upper-case ('$ 0'))   
 
 
  \ b  Expression XML Schema is not part of regular expressions. It is only considered as character B, and therefore you match with B after any other character. 
 
 Your replacement string here is  upper case ('$ 0')  just  $ 0  and so you replace the character (s) with it yourself Are there. 
 
 You can not do this by using the function - you need something like  xsl: analysis-string, from XSLT , but it is not available in XQuery 1.0. 
 
 As far as I can tell the only way to solve it with a recursive function. If your separator is not required to be protected, a simple solution can be used to use tokens. 
 
  Function declares local: xs: string {if (string-lang ($ arg = $) = 0) and then $ first word as title-case ($ arg as xs: string) Let: $ Tokenize ($ AGR, "\ s") [1] Let's give $ first: = substrings ($ AGR, 1, 1) returns (string-long ($ first-word) = 0) then concat ($ First, the local: title-case (object ($ ARG, 2)) and if ($ first-word = "a" (or :: or any other word that should not be capitalized :)) then conat ($ first word, Local: Title-of ($ $ AGR, string-latte ($ first-word) + 1) Other concette (upper-case ($ first), substring ($ first word, 2), local: title-case ($ ARG, string- You will also need to make sure that the first word of each title is capitalized even when a small word like "A" is lying ($ first-word) + (1- first-word) + 1))}}  
 
 , But I leave it as a practice for the reader. / P>

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