select string with specific character in regular expression

Question

Given the following text of example:

Hello $NAME$ how are you? You are visiting this $LOGIN_PAGE$ page, please fill the form and log in.

I want to select only the following "variable" $LOGIN_PAGE$ without select even the $NAME character.

I made this regex trying to achieve the result but it select both of the string

(\$([A-Z\_])+\$)

Which part I'm missing in this regex?

Sorry not clear if the string is constant then why are you using regex. — Braj
– Braj, Commented Jul 19, 2014 at 16:45

Avinash Raj · Accepted Answer · 2014-07-19 16:47:29Z

1

The below regex would match only the the string which has only capital letters separated by underscore symbol where the start and end of the string is $,

\$[A-Z]+_[A-Z]+\$

DEMO

Your PHP code would be,

<?php
$data = 'Hello $NAME$ how are you? You are visiting this $LOGIN_PAGE$ page, please fill the form and log in.' ;
$regex =  '~\$[A-Z]+_[A-Z]+\$~';
if (preg_match($regex, $data, $m)) {
    $yourmatch = $m[0]; 
    echo $yourmatch;
    }
?> //=> $LOGIN_PAGE$

edited Jul 19, 2014 at 16:47

answered Jul 19, 2014 at 16:41

Avinash Raj

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