preg-replace Examples and Free Source Code

What does \W+ mean in a regular expression?...

php regex preg-replace metacharacters

Replace Javascript concatenation expression in a string with <em> tag...

php regex preg-replace

Inject <br> between numbered sentences ending in a dot, but not after dots preceded by a numbe...

php regex preg-replace sentence

Does preg_replace() modify by reference or return a value?...

php regex preg-replace

Replace a double curly braced placeholder with a method call as the replacement parameter of preg_re...

php regex callback preg-replace placeholder

What's the difference between \1 versus $1 in the second paramter of preg_replace()?...

php regex preg-replace backreference capture-group

Why are all backreferences in replacement string of preg_replace() empty?...

php regex preg-replace backreference capture-group

Convert url string wrapped in BBcode-style [url] and [/url] tags into an HTML hyperlink...

php regex hyperlink preg-replace bbcode

Convert pairs of square brace placeholders into an HTML hyperlink...

php hyperlink preg-replace placeholder square-bracket

Replace @mentions with an HTML hyperlink...

php regex hyperlink preg-replace mention

Regex containing forward slash creates Warning...

php regex escaping preg-replace delimiter

Insert a dot then a space after a lowercase letter which is immediately followed by an uppercase let...

php regex preg-replace

Replace one or more non-alphanumeric characters with underscores...

php regex preg-replace alphanumeric snakecasing

Convert URLs to hyperlinks in HTML without replacing src attribute values...

php regex hyperlink html-parsing preg-replace

How to access capture groups in the replacement parameter of preg_replace()?...

php regex preg-replace backreference capture-group

Using preg_replace to modify square brace placeholders in a string is incorrectly matching multiple ...

php preg-replace shortcode placeholder quantifiers

Using preg_replace() to convert alphanumeric strings from camelCase to kebab-case...

php regex preg-replace camelcasing kebab-case

Replace matched uppercase letter with its lowercase version (camelCase to kebab-case)...

php regex preg-replace camelcasing kebab-case

Inject a comma between alphanumeric substrings and non-alphanumeric substrings...

php regex preg-replace alphanumeric non-alphanumeric

Isolate substring from first asterisk to second asterisk and use the first word of the match in the ...

php regex replace preg-replace

Replace "@@" with "#" only if contained within "{{" and "}}"...

php regex replace preg-replace placeholder

Parse HTML and reformat dollar amount in tag with specific class...

php regex preg-replace currency-formatting reformatting

Get string between two specific characters in a string...

php regex preg-replace text-extraction text-parsing

Remove all square brace placeholders from a string...

php regex preg-replace placeholder square-bracket

Get all float numbers following an @ symbol...

php regex preg-replace sanitization textmatching

Replace literal string in text if another literal string doesn't exist in the text...

php regex replace preg-replace preg-match

Get comma-separed latitude and longitude values from a larger body of text...

php regex preg-replace text-extraction

Regex to match a curly braced placeholder is incorrectly matching multiple placeholders at once...

php regex preg-replace regex-greedy character-class

Replace square brace placeholder with dynamic replacement text...

php regex dynamic preg-replace placeholder

Replace a blacklisted word even if it has extra characters between matching characters...

php regex preg-replace sanitization blacklist