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Count occurrences of a word in string (edit)
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== Excel == | == Excel == | ||
If multiple values was allowed in a single cell | |||
* Using the function [https://support.office.com/zh-tw/article/substitute-%E5%87%BD%E6%95%B8-6434944e-a904-4336-a9b0-1e58df3bc332 SUBSTITUTE] & [https://support.office.com/zh-hk/article/len%E3%80%81lenb-%E5%87%BD%E6%95%B8-29236f94-cedc-429d-affd-b5e33d2c67cb LEN] functions. [https://docs.google.com/spreadsheets/d/1eg5XuGs8X7bS_RrFECx8ktuPgTwpV12UPfkdlpbHlMU/edit?usp=sharing demo]<ref>[https://errerrors.blogspot.com/2022/02/excel-calculate-text-occurrence.html Excel 計算文字出現次數]</ref>. Or | |||
If multiple values was '''NOT''' allowed in a single cell | |||
* Using the function [https://support.office.com/zh-hk/article/countif-%E5%87%BD%E6%95%B8-e0de10c6-f885-4e71-abb4-1f464816df34 COUNTIF] | |||
== MySQL way == | == MySQL way == | ||
| Line 33: | Line 37: | ||
== PHP == | == PHP == | ||
Using the [https://www.php.net/manual/en/function.mb-substr-count.php mb_substr_count] ('''binary safe''') or [https://www.php.net/manual/en/function.substr-count.php substr_count] functions. See details on [http://sandbox.onlinephpfunctions.com/code/ | Using the [https://www.php.net/manual/en/function.mb-substr-count.php mb_substr_count] ('''binary safe''') or [https://www.php.net/manual/en/function.substr-count.php substr_count] functions. See details on [http://sandbox.onlinephpfunctions.com/code/0b72da5f00701341c77623889d177750242cbb7a demo]. | ||
<pre> | <pre> | ||
<?php | |||
$input = 'an apple a day keeps the doctor away'; | $input = 'an apple a day keeps the doctor away'; | ||
$term = 'apple'; | $term = 'apple'; | ||
echo substr_count($input, $term); | echo substr_count($input, $term) . PHP_EOL; | ||
$input = '一天一蘋果，醫生遠離我'; | |||
$term = '蘋果'; | |||
echo mb_substr_count($input, $term, 'UTF-8') . PHP_EOL; | |||
</pre> | </pre> | ||
== BASH == | == BASH == | ||
data preparation | data preparation | ||
* (1) separate each string by [[Return symbol | return_symbol]] | * (1) separate each string by [[Return symbol | return_symbol]] <ref>[https://www.unix.com/shell-programming-and-scripting/83076-replacing-commas-newlines-using-sed.html replacing comma's with newlines using sed]</ref> | ||
* (2) check the [https://www.computerhope.com/unix/uuniq.htm uniq command] is exists on Cygwin of {{Win}} or {{Linux}} | * (2) check the [https://www.computerhope.com/unix/uuniq.htm uniq command] is exists on Cygwin of {{Win}} or {{Linux}} | ||
* (3) execute the following command {{kbd | key=<nowiki>sort <file.txt> | uniq -ic | sort -nr</nowiki>}}<ref>[https://unix.stackexchange.com/questions/134446/counting-the-occurrences-of-the-string text processing - Counting the occurrences of the string - Unix & Linux Stack Exchange]</ref><ref>[https://unix.stackexchange.com/questions/170043/sort-and-count-number-of-occurrence-of-lines Sort and count number of occurrence of lines - Unix & Linux Stack Exchange]</ref> | * (3) (optional) input the command {{kbd | key=<nowiki>export LC_ALL='C'</nowiki>}} on Cygwin of {{Win}} if met the error message "Invalid or incomplete multibyte or wide character" after input the following {{kbd | key=<nowiki>sort</nowiki>}} command | ||
* (4) execute the following command {{kbd | key=<nowiki>sort <file.txt> | uniq -ic | sort -nr</nowiki>}}<ref>[https://unix.stackexchange.com/questions/134446/counting-the-occurrences-of-the-string text processing - Counting the occurrences of the string - Unix & Linux Stack Exchange]</ref><ref>[https://unix.stackexchange.com/questions/170043/sort-and-count-number-of-occurrence-of-lines Sort and count number of occurrence of lines - Unix & Linux Stack Exchange]</ref> | |||
* (5) Remove the leading whitespace in the file: Using the [[Text editor with support for regular expression | text editor]] with support for [[Regular expression|regular expression]] and replace {{kbd | key=<nowiki>^\s+(\d+)\s+</nowiki>}} with {{kbd | key=<nowiki>\1\t</nowiki>}} | |||
=== Input Format A: One term per line === | |||
{{exclaim}} Each line contains only one term/keyword | |||
file: test.txt | file: test.txt | ||
| Line 57: | Line 73: | ||
</pre> | </pre> | ||
Result of the execution of command: {{kbd | key=<nowiki>sort test.txt | uniq -ic | sort -nr</nowiki>}} | ==== Output format I: count followed by keyword ==== | ||
{{exclaim}} The term each line in the input file was allowed contains whitespaces. | |||
Result of the execution of command: {{kbd | key=<nowiki>sort test.txt | uniq -ic | sort -nr</nowiki>}} {{exclaim}} case insensitive | |||
<pre> | <pre> | ||
2 #Apple | 2 #Apple | ||
| Line 66: | Line 85: | ||
</pre> | </pre> | ||
Result of the execution of command: {{kbd | key=<nowiki>sort test.txt | uniq -c</nowiki>}} | Result of the execution of command: {{kbd | key=<nowiki>sort test.txt | uniq -c</nowiki>}} {{exclaim}} case sensitive | ||
<pre> | <pre> | ||
1 #Apple | 1 #Apple | ||
| Line 75: | Line 94: | ||
1 #電影 | 1 #電影 | ||
</pre> | </pre> | ||
==== Output format II: keyword followed by count ==== | |||
{{exclaim}} The term each line in the input file should '''not''' contains whitespaces. | |||
Result of the execution of command: {{kbd | key=<nowiki>sort test.txt | uniq -ic | sort -nr | awk ' { t = $1; $1 = $2; $2 = t; print; } '</nowiki>}} <ref>[https://stackoverflow.com/questions/11967776/swap-two-columns-awk-sed-python-perl Swap two columns - awk, sed, python, perl - Stack Overflow]</ref>{{exclaim}} case insensitive | |||
<pre> | |||
#Apple 2 | |||
#電影 1 | |||
#追劇 1 | |||
#藍芽 1 | |||
#綜藝 1 | |||
</pre> | |||
Result of the execution of command: {{kbd | key=<nowiki>sort test.txt | uniq -c | sort -nr | awk ' { t = $1; $1 = $2; $2 = t; print; } '</nowiki>}} {{exclaim}} case sensitive | |||
<pre> | |||
#電影 1 | |||
#追劇 1 | |||
#藍芽 1 | |||
#綜藝 1 | |||
#apple 1 | |||
#Apple 1 | |||
</pre> | |||
=== Input Format B: Multiple terms per line === | |||
{{exclaim}} Each line contains multiple terms/keywords separated by spaces | |||
file: input.txt | |||
<pre> | |||
電影 追劇 綜藝 | |||
藍芽 apple 電影 | |||
電影 綜藝 | |||
</pre> | |||
==== Method using awk for word frequency counting ==== | |||
{{kbd | key=<nowiki>awk '{for(i=1;i<=NF;i++) count[$i]++} END {for(word in count) print count[word], word}' input.txt | sort -nr</nowiki>}} | |||
Output: | |||
<pre> | |||
3 電影 | |||
2 綜藝 | |||
1 追劇 | |||
1 藍芽 | |||
1 apple | |||
</pre> | |||
How it works: | |||
* {{kbd | key=<nowiki>{for(i=1;i<=NF;i++) count[$i]++}</nowiki>}} - Loop through each field (word) in each line and increment its count | |||
* {{kbd | key=<nowiki>END {for(word in count) print count[word], word}</nowiki>}} - After processing all lines, print count and word for each unique word | |||
* {{kbd | key=<nowiki>sort -nr</nowiki>}} - Sort numerically in descending order | |||
=== Verification of count occurrence === | |||
<pre> | |||
cat test.txt | grep -i "#apple$" | wc -l | |||
# or | |||
cat test.txt | grep -iw "#apple" | wc -l | |||
</pre> | |||
Options<ref>[https://en.wikibooks.org/wiki/Grep Grep - Wikibooks, open books for an open world]</ref> | |||
* {{kbd | key=<nowiki>-i</nowiki>}} means {{kbd | key=<nowiki>Ignore uppercase vs. lowercase.</nowiki>}} | |||
* {{kbd | key=<nowiki>-w</nowiki>}} means {{kbd | key=<nowiki>--word-regexp</nowiki>}} | |||
== Further reading == | |||
* [http://stackoverflow.com/questions/12344795/count-the-number-of-occurences-of-a-string-in-a-varchar-field mysql - Count the number of occurences of a string in a VARCHAR field? - Stack Overflow] {{access | date = 2016-09-21}} | |||
* [https://www.got-it.ai/solutions/excel-chat/excel-tutorial/conditional-formatting/most-frequently-occurring-text Excel formula: Most frequently occurring text - Excelchat] | |||
== References == | == References == | ||
<references /> | |||
[[Category:Software]] [[Category:Programming]] [[Category:Data Science]] [[Category: | [[Category: Software]] | ||
[[Category: Programming]] | |||
[[Category: Data Science]] | |||
[[Category: String manipulation]] | |||
[[Category: Data transformation]] | |||
[[Category: MySQL]] | |||
[[Category: Revised with LLMs]] | |||