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You need to escape the / because it is used to end the first part of the regex string, after which a modifier such as g (global) is used and d is not a valid option there (the d from div).

Make it \/

            $foo = preg_replace("/^<div id='IDHERE'>sometext.<\/div>/", '', $foo);

Regex unknown modifier '[' in validation, Regex unknown modifier '[' in validation. David Hobbs. May 24, 2018. I have this validation: validate: "regex:/^[0-9A-F]+\/[0-9A-F]+$/". So I have escaped the “Unkown modifier ‘g’” often indicates a regex that was copied verbatimly from JavaScript or Perl. preg_match("/abc+/g" ⬆ PHP doesn’t use the /g global flag.

Escape the closing </div> tag:

$foo = preg_replace("/^<div id='IDHERE'>sometext.<\/div>/", '', $foo);

PHP was interpreting the forward slash in the closing div tag as being the end of the expression:

/^<div id='IDHERE'>sometext.</div>/
                             ^ PHP thinks this is the end,
                               then complains about the unknown modifier 'd'

Possible modifiers in regex patterns - Manual, If you're using POSIX character classes in your regex that indicate case such as [:upper:] Warning: preg_match_all(): Unknown modifier 'J' in test.php on line 3 regex – "Unknown modifier 'g' in…" when using preg_match in PHP? Posted by: admin April 10, 2020 Leave a comment. Questions: This is the regex I’m trying to use:

add \ in your pattern:

 $foo = preg_replace("/^<div id='IDHERE'>sometext.<\/div>/", '', $foo);

and here reference.

Unknown modifier error with regular expression matching, I get this error: preg_match(): Unknown modifier 'r' in rules_data_text_comparison() (line 423 /admin\/remaining-pairs\/\d*\/\ Dynamically select from a dynamically generated dropdown. php,html,select,drop-down-menu. It is because you aren't ending the value attribute, so your selected option becomes <option value="optionvalueselected" -- 'optionvalue' being the value of your selected option, and 'selected' being the attribute you want to set, but won't be set because you never ended value The following should work

You need to escape / in </div>, so your regex should be:

$foo = preg_replace("/^<div id='IDHERE'>sometext.<\/div>/", '', $foo);

Warning: preg_match() [function.preg-match]: Unknown modifier , I got this error message while trying to create validation using "Regular Expression". Please tell me where I did wrong, or someone please tell "Unkown modifier 'g'" often indicates a regex that was copied verbatimly from JavaScript or Perl. preg_match("/abc+/g" ⬆ PHP doesn't use the /g global flag.

Warning: preg_match(): Unknown modifier 'd', Warning: preg_match(): Unknown modifier 'd' " believe the solution is as you mentioned to dynamically escape all the regex metacharacters. PHP Developers Network A community of PHP developers offering assistance, advice, discussion, and friendship.

InnerBrowser Unknown modifier · Issue #3581 · Codeception , 'li.active'); I see this in log preg_match(): Unknown modifier '/' in file Regex pattern of preg_match on line 227 expects argument with Exception in thread "main" java.util.regex.PatternSyntaxException: Unknown inline modifier near index 10

Mastering Regular Expressions, “Unknown. Modifier”. Errors. On more than a few occasions, a program I'm working to add delimiters to a regular expression when creating a pattern argument. Hi, I have this warning message outputted from php server Warning: preg_match() [function.preg-match]: Unknown modifier '_' I found that UAPArser is using regexes.yaml file, which is automa