CODEWITHSUNDEEP
phpregexpreg-replacepcre
Jonas
Jonas

Reputation: 31

Replace all spaces in string inside curly braces

I need to replace all spaces in strings inside curly braces (including a prefix). Example:

From: x{Test test} test test x{Test test test } test {Test test}

To x{Test_test} test test x{Test_test_test } test {Test test}

(only applies to x{} - when curly braces include x prefix)

I can do it with help of lookhead/lookbehind but this does not work in PHP/PCRE

`(?<=x\{[^\{\}]+)\s+(?=[^\{\}]+\})`

The problem is how to do it PHP/PCRE compatible with preg_replace function?

Upvotes: 2

Views: 261

Answers (1)

anubhava
anubhava

Reputation: 786271

You may use \G bases regex for this:

$str = 'x{Test test} test test x{Test test test } test {Test test}';

$repl = preg_replace('/(?:x{|(?<!^)\G)[^\s}]*\K\s+(?!})/', '_', $str);
//=> x{Test_test} test test x{Test_test_test } test {Test test}

RegEx Demo

RegEx Details:

  • \G asserts position at the end of the previous match or the start of the string for the first match.
  • (?:x{|(?<!^)\G): Matches x{ or end of previous match
  • \K: Reset current match info
  • \s+: Match 1+ whitespace
  • (?!}): Assert we don't have an } immediate ahead

Upvotes: 3

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