php replace regex - Brave Search

Using PHP replace regex with regex

stackoverflow.com › questions › 22040272 › using-php-replace-regex-with-regex

$input_lines="any word here related to #English must #be replaced.";
$result = preg_replace("/(#\w+)/", "<a href='bla bla'>$1</a>", $input_lines);

DEMO

OUTPUT:

any word here related to <a href='bla bla'>#English</a> must <a href='bla bla'>#be</a> replaced.

Answer from Nambi on Stack Overflow

php.net › manual › en › function.preg-replace.php

PHP: preg_replace - Manual

preg_replace() returns an array if the subject parameter is an array, or a string otherwise. If matches are found, the new subject will be returned, otherwise subject will be returned unchanged or null if an error occurred.

w3schools.com › php › func_regex_preg_replace.asp

PHP preg_replace() Function

❮ PHP RegExp Reference · Use ... » · The preg_replace() function returns a string or array of strings where all matches of a pattern or list of patterns found in the input are replaced with substrings....

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December 11, 2017

stackoverflow.com › questions › 22040272 › using-php-replace-regex-with-regex

Using PHP replace regex with regex - Stack Overflow

$input_lines="any word here related to #English must #be replaced.";
$result = preg_replace("/(#\w+)/", "<a href='bla bla'>$1</a>", $input_lines);

DEMO

OUTPUT:

any word here related to <a href='bla bla'>#English</a> must <a href='bla bla'>#be</a> replaced.

This should nudge you in the right direction:

echo preg_replace_callback('/#(\w+)/', function($match) {
    return sprintf('<a href="https://www.google.com?q=%s">%s</a>', 
        urlencode($match[1]), 
        htmlspecialchars($match[0])
    );
}, htmlspecialchars($text));

See also: preg_replace_callback()

php - How to i replace regex patterns using preg_replace function?

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PHP regex - find and replace

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phpliveregex.com

Test PHP regular expressions live in your browser and generate sample code for preg_match, preg_match_all, preg_replace, preg_grep, and preg_split!

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Search and Replace Strings With Regular Expressions in PHP | Envato Tuts+

March 30, 2021 - We began by learning how to use preg_match() or preg_match_all() to get all the strings that match a specific pattern. After that, we learned how to use preg_replace() and preg_replace_callback() to replace the matched patterns with some other ...

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In such cases, str_replace can be faster than the preg_replace regex function: $string=str_replace('10','20','$string'); The preg_replace function comes in when you need a regex pattern to match the string to be replaced, for instance if you only wanted to replace '10' when it stands alone ...

geeksforgeeks.org › php › php-preg_replace-function

PHP | preg_replace() Function - GeeksforGeeks

July 11, 2025 - Program 1: The following program replaces string by using the regular expression parameter. ... <?php // PHP program to illustrate // preg_replace function $string = 'November 01, 2018'; $pattern = '/(\w+) (\d+), (\d+)/i'; $replacement = '${1} 02, $3'; // print output of function echo preg_replace($pattern, $replacement, $string); ?>

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stackoverflow.com › questions › 13528337 › regex-str-replace

php - Regex str_replace - Stack Overflow

Check out preg_replace here, this is what you are lookin for.

// From the documentation.
preg_replace($regularExpression, $replacement, $subject);

What you're looking for is preg_replace:

$pg = preg_replace('{regex goes here}', '{replacement goes here}', $pg);

captainnoob.medium.com › command-execution-preg-replace-php-function-exploit-62d6f746bda4

Command Execution - preg_replace() PHP Function Exploit | RCE

October 10, 2020 - After executing this , preg_replace() the search for `as` and replace with `As` . ... To exploit the code, all the attacker has to do is provide some PHP code to execute, generate a regular expression which replaces some or all of the string with the code, and set the `e` modifier on the regular expression/pattern

superuser.com › questions › 1207410 › phps-preg-replace-function-is-not-replacing-all-lines

regex - PHP's preg_replace() function is not replacing all lines - Super User

Depending on how the implementation of PHP does it, I think you're missing either an option or your regex doesn't do what you think it does.

/^(\d{1,2}[^0-9])/

The above regex would look for 1-2 numbers followed not by numbers from the start of the string. Depending on how it works a line break doesn't indicate that ^ should match again.

If you look at the PCRE Pattern Modifiers in the manual you likely need to supply the m flag to turn on multi line mode.

In addition, though it's missing from that manual page, you might need the global flag. So the above regex would become:

/^(\d{1,2}[^0-9])/gm

You might also be able to test this regular expression on platforms like RegEx 101.

smarty.net › docs › en › language.modifier.regex.replace.tpl

regex_replace | Smarty

A regular expression search and replace on a variable. Use the preg_replace() syntax from the PHP manual. Although Smarty supplies this regex convenience modifier, it is usually better to apply regular expressions in PHP, either via custom functions or modifiers.

w3schools.com › php › php_regex.asp

PHP Regular Expressions

flush() ob_clean() ob_end_clean() ob_end_flush() ob_flush() ob_get_clean() ob_get_contents() ob_get_flush() ob_get_length() ob_get_level() ob_gzhandler() ob_implicit_flush() ob_list_handlers() ob_start() output_add_rewrite_var() output_reset_rewrite_vars() PHP RegEx · preg_filter() preg_grep() preg_last_error() preg_match() preg_match_all() preg_replace preg_replace_callback preg_replace_callback_array preg_split preg_quote PHP SimpleXML ·

stackoverflow.com › questions › 7297052 › php-replace-all-instances

regex - PHP: Replace all instances - Stack Overflow

A correct answer to this question has been provided previously:

Look at the second answer:

PHP: insert text up to delimiter

In addition, your implementation is wrong, look at the regular expression it should start with ^ :

echo preg_replace('/(.*?):/', "<font color=#F00>$1</font>:", $output);

Should be:

echo preg_replace('/^(.*?):/', "<font color=#F00>$1</font>:", $output);

try:

echo preg_replace('/^(.*?):(.*?)$/s', "<font color=#F00>\\1</font>:\\2", $output);

EDIT: This should work (tried it):

trim(preg_replace("/(?:\n)(.*?):(.*?)/s", "<font color=#F00>\\1</font>:\\2", "\n".$str))

Final try, maybe try to explode it instead:

<?php
$content = 'name: some text
name2: more text
name: text
name3: text';
$tmp = explode("\n", $content);
for($i = 0; $i < count($tmp); $i ++) {
    $tmp[$i] = '<span style="color:#F00">'.str_replace(':', '</span>:', $tmp[$i], 1);
}
echo implode("\n", $tmp);
?>

This does assume that whatever is before the colon, it won't have another colon.

My bad, I misunderstood str_replace()'s last parameter. Try this:

<?php
$tmp = explode("\n", $content);
for($i = 0; $i < count($tmp); $i ++) {
    $tmp2 = explode(':', $tmp[$i]);
    $tmp2[0] = '<span style="color:#F00">'.$tmp2[0].'</span>';
    $tmp[$i] = implode(':', $tmp2);
}
echo implode("\n", $tmp);

medium.com › @wearedopethemes › replacing-ereg-replace-with-preg-replace-in-php-for-regex-handling-e4cdf53450e2

Replacing ereg_replace() with preg_replace() in PHP for Regex Handling | by DopeThemes.com | Medium

September 3, 2024 - Case Sensitivity: Unlike ereg_replace(), which is case-insensitive by default, preg_replace() requires you to specify the i modifier for case-insensitive matches, giving you more control over your regex patterns. Compatibility: Since ereg_replace() has been deprecated and removed from PHP, continuing to use it in your code can prevent you from upgrading to newer versions of PHP, exposing your applications to security risks and missing out on performance improvements.

reintech.io › blog › understanding-implementing-php-preg-replace-function

Understanding and Implementing PHP's `preg_replace()` Function

April 14, 2023 - Learn how to use PHP's preg_replace() function for string manipulation tasks, including working with regular expressions and callback functions.

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nusphere.com › kb › phpmanual › function.preg-replace.htm

PHP Manual: preg_replace

PhpED - PHP IDE integrated development environment for developing web sites using PHP, HTML, Perl, JScript and CSS that combines a comfortable editor, debugger, profiler with the MySQl, PostrgeSQL database support based on easy wizards and tutorials.Easy to use for debugging PHP scripts, publishing ...