bhttps?:[^)''"]+.(?:jpg|jpeg|gif|png)

<cfset variables.getImageURLs = reMatch('bhttps?:[^)''"]+.(?:jpg|jpeg|gif|png)', variables.getDocument) />

<img src="/local/images/get_profile_pic.php?id=12345" title="John Doe" />

<imgs+[^>]*?src=("|')([^"']+)1

<cfset html = variables.getDocument /> <!--- your HTML --->
<cfset pattern = CreateObject("java","java.util.regex.Pattern").compile('(?i)<imgs+[^>]*?src=("|')([^"']+)1') />
<cfset matcher = pattern.matcher(html) />

<!--- loop through the matches --->
<cfloop condition="matcher.find()">
    <cfset src = matcher.group(2) />
</cfloop>

<img           - Literal string "<img", match the opening tag
s+            - Match one or more whitespace characters, so <imgt is valid
[^>]*?         - Lazily match any character that is not a '>' while looking for the next literal string
src=           - Literal string "src="
("|')          - Match either a single or a double quote, both are valid in HTML
([^"']+)       - Match anything that isn't a single or double quote. Note: You *could* use [^1] here, however this way the match will reject malformed HTML attributes that have mismatched quotes
1             - Match the value of the first group (either a single or double quote)

bhttps?:[^)''"]+.(?:jpg|jpeg|gif|png)(?![a-z/])