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---
pageid: expr.pcre
title: pcre & ipcre
layout: docs
section: Expression Terms
permalink: docs/expr/pcre.html
---
*To use this feature, you must configure watchman `--with-pcre`!*
The `pcre` expression performs a Perl Compatible Regular Expression match
against the basename of the file. This pattern matches `test_plan.php` but not
`mytest_plan`:
["pcre", "^test_"]
You may optionally provide a third argument to change the scope of the match
from the basename to the wholename of the file.
["pcre", "txt", "basename"]
["pcre", "txt", "wholename"]
`pcre` is case sensitive; for case insensitive matching use `ipcre` instead;
it behaves identically to `pcre` except that the match is performed ignoring
case.
*Since 2.9.9.*
Starting in version 2.9.9, on OS X systems where the watched root is a case
insensitive filesystem (this is the common case for OS X), `pcre` is equivalent
to `ipcre`.
*Since 4.7.*
You can override the case sensitivity of all name matching operations used
in the query by setting the `case_sensitive` field in your query.
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