Wine is a software to allow running Windows applications in Linux, MAC etc. platforms. It is available for installation from package managers like yum (RHEL, CentOS) and apt (Ubuntu). You can find more details on how it works in Wine wiki . But the default Wine package available from package manager does not have support for 32 bit Windows applications. This was the case for me. In Redhat Enterprise Linux 7.3, the wine package did not contain support for 32 bit windows applications. So the only option was to build a separate rpm of wine which will include this support. All the steps are executed on a RHEL 7.3 VM (x86_64). Step 1 Download and run shell script which will make wine 64 and 32 support for RHEL: https://github.com/zma/usefulscripts/blob/master/script/install-wine-i686-centos7.sh It accepts a version no. as CLI parameter e.g. 2.0.3 The script installs wine in /usr/local/ directory by default. We can verify the files that are being copied for wine using "...
Recently I have been stuck in a regular expression where I had to use grouping in places, values of which were not required. It won't make sense to explain the problem without the text. So here it is
Controller Id Connection Status Connection State Secure Role
------------- ----------------- ---------------- ------ ------
1 Connected Active No Slave
25 Disconnected Idle No Master
My goal was to get the numeric values at the beginning of the line while still matching the whole line for safety (so that any other numeric values in the output don't match). As you see in the output, each column can contain a value from a list of fixed values. e.g. Connection Status can only contain Connected or Disconnected. That demands the following regular expression -
But with the above expression, we are fetching all the columns when all we want is the first column. This is where the non capturing group of regular expression comes into picture. With the help of non capturing groups we can remove them from the matched output while still using the grouping functionality.
Corrected regular expression is as below -
By using the "?:" combination just after the parenthesis, we can instruct regular expression engine to not include that group in the matched output. This can be used anywhere we want to use grouping but the value is not needed in the matched output.
Controller Id Connection Status Connection State Secure Role
------------- ----------------- ---------------- ------ ------
1 Connected Active No Slave
25 Disconnected Idle No Master
My goal was to get the numeric values at the beginning of the line while still matching the whole line for safety (so that any other numeric values in the output don't match). As you see in the output, each column can contain a value from a list of fixed values. e.g. Connection Status can only contain Connected or Disconnected. That demands the following regular expression -
But with the above expression, we are fetching all the columns when all we want is the first column. This is where the non capturing group of regular expression comes into picture. With the help of non capturing groups we can remove them from the matched output while still using the grouping functionality.
Corrected regular expression is as below -
By using the "?:" combination just after the parenthesis, we can instruct regular expression engine to not include that group in the matched output. This can be used anywhere we want to use grouping but the value is not needed in the matched output.
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