CODEWITHSUNDEEP
phpregex
Lars Vegas
Lars Vegas

Reputation: 231

preg_replace same words in a string

String: this is text :wall: :wall: :wall: :wall: more text

Output should be: this is text :wall: more text

Task: Reduce the word :wall: to only 1.

I tried these both ideas, but didn't work:

$post_message = preg_replace("/([\:wall:])+/", "\\1", $post_message);

$post_message = preg_replace('/:wall:/', '', $post_message, 1);

Upvotes: 0

Views: 345

Answers (4)

Lake
Lake

Reputation: 913

$str = 'this is text :wall: :wall: :wall: :wall: more text';
$post_message = preg_replace("#(:wall:\s+)+#i", '\1', $str);

Upvotes: 0

Lars Vegas
Lars Vegas

Reputation: 231

Accordingliy to the top solution:

I need:

String1: this is text :( :( :( more text

String2: this is text :? :? :? more text

Output should be: this is text :( more text

Output should be: this is text :? more text

Task: Reduce the smilie :( to only 1.

Task: Reduce the smilie :? to only 1.

I tried these, but didn't work:

$post_message = preg_replace('~(:()(?:\s+\1)+~', '$1', $post_message);

$post_message = preg_replace('~(:?)(?:\s+\1)+~', '$1', $post_message);

Thanks again.

Upvotes: 0

Avinash Raj
Avinash Raj

Reputation: 174706

Use the below regex in preg_replace function.

Regex:

(:wall:)(?:\s+:wall:)+

OR

(:wall:)(?:\s+\1)+

Replacement string:

$1

DEMO

Code:

<?php
$str = "this is text :wall: :wall: :wall: :wall: more text";
echo preg_replace('~(:wall:)(?:\s+\1)+~', '$1', $str);
?>

Output:

this is text :wall: more text

(:wall:) Captures the text :wall: into a group. This could be referred by group index 1. So this (?:\s+\1)+ matches the folowing one or more space + :wall: strings. Replacing the match with the chars inside group index 1 will remove all the duplicate :wall: strings.

Upvotes: 1

vks
vks

Reputation: 67968

(:wall:)(?=((?!\1).)*\1)

Try this.Replace by empty string.See demo.

http://regex101.com/r/lZ5mN8/62

Upvotes: 0

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