与{{string | trans}}匹配的正则表达式

Question

I have multiple .phtml files and I would like to select all the strings before |trans }}, without {{ before the string.

Like this:

{% block title %}{{ 'Detail Hostess:'|trans }} {{ host.Name }}{% endblock %}

Now I would like to select 'Detail Hostess:' . This is the regex that I have now:

/\{{2}\s*([^|]+)\|trans\s*\}{2}/i

Sometimes it works, but in the case above he selects 'Detail Hostess:' and
host.Name }}{% endblock %} {% block content

So how can I fix the regex?

Answer 1

Your issue might be linked to the fact that when you use [^|]+ , there's nothing to prevent you from going outside of a {{...}} construct: your regex will match host.Name }}{{ 'Detail Hostess:' in {{ host.Name }}{{ 'Detail Hostess:'|trans }} .

If you're sure there can be no } in your wanted text, a quick fix would be replacing [^|] with [^|}] :

{{\s*([^|}]+)\|trans\s*}}

Btw in PHP no need to escape the { if it's not followed by a digit, nor } if not preceded by one: see demo .

Answer 2

I think that having the "|trans" mark, there is no need to check for "|" or "}", you just have to look for "|trans", but using a lazy quantifier.

/{{\s*(.+?)\|trans\s*}}/i

Test: http://www.phpliveregex.com/p/4Ly

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Edit. Correction fixing what Casimir et Hippolyte says.

The advantage of this solution is that there are not forbidden characters inside the searched string.

Robin 's answer may be faster, but the searched string cannot contain "|" or "}" characters.

Answer 3

Thanks at @Robin. This is the expression I'm finally using to parse translation filters in Twig:

{{([^}]+)\|(?:transchoice\((.*?)\)|transchoice|trans|trans\((.*?)\))(?:\|([^}]+)|\s*)}}

this RegEx covers:

{{ 'foo'|trans }}
{{ 'foo %variable%'|trans({'%variable%':'foo'}) }}
{{ 'foo'|humanize|trans }}
{{ 'foo %variable%'|trans({'%variable%':'foo'})|capitalize }}

and also all variants with transchoice .