CODEWITHSUNDEEP
regexbashshellgit-bash
Victor Grazi
Victor Grazi

Reputation: 16470

Why do git commit-msg on Windows not match regex

I am trying to create a git commit-msg hook, which includes a simple regex to verify the log message. It is not working using the usual bash syntax.

I tried it using a very simple regex, and it is still not working

Any idea what I might be doing wrong?

Here is a simple example including an obvious match, but it is printing out "no match"

#!/bin/bash
message="[GLSD-0000]"
echo "Message: '$message'"
regex="\[GLSD-\w+\]"
if [[ $message =~ $regex ]]; then echo "yes";else echo "no match!"; fi

Using git version 2.18.0.windows.1

Upvotes: 2

Views: 1751

Answers (1)

Inian
Inian

Reputation: 85530

A few things to note from you attempt made,

  1. Your interpreter does #!/bin/sh does not support the regex operation in bash, even-though you have not used it. You should be using the bourne again shell bash (#!/usr/bin/env bash).
  2. The [[..]] with an = does a string match on left side operand with the right side operand. For regular expression support, you need to use the ~ operator
  3. The bash only supports a minimal version of ERE (Extended Regular expression) in which \w (all words) is not supported.

So in a script targeted for a bash shell, you should be writing it as

#!/usr/bin/env bash

# equivalent of '\w' in the regex flavor supported by bash
re='\[GLSD-[A-Za-z0-9_]+\]'
msg='[GLSD-0000]'
[[ $msg =~ $re ]] && echo "yes" || echo "no match!"

Upvotes: 4

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