Count occurrences of a substring: Difference between revisions

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=={{header|Tcl}}==
The regular expression engine is ideal for matching this task, especially as the <tt>***=</tt> prefix makes it interpret the rest of the argument as a literal string to match:
<lang tcl>proc countSubstrings {haystack needle} {
regexp -all ***=$needle $haystack
Retrieved from "https://rosettacode.org/wiki/Count_occurrences_of_a_substring"