Bash Regex if else

Question

In Bash I'm trying to check if a string is in the appropriate format.

#!/bin/bash

COMMIT_MSG="release/patch/JIRA-123"

[[ $COMMIT_MSG =~ 'release\/(major|minor|patch)\/[A-Z\d]+-\d+' ]] && echo "yes" || echo "no"

This is the regex I've used to match the string as patch could be either major or minor and JIRA-123 is Jira Ticket ID but when trying it in the Bash regex it always returns no.

Use [[ $COMMIT_MSG =~ release/(major|minor|patch)/[A-Z0-9]+-[0-9]+ ]] . Don't quote the regex and use 0-9 instead of \d. — M. Nejat Aydin
– M. Nejat Aydin, Commented Aug 25, 2022 at 19:16
Quoting the pattern makes bash treat it as a literal string, rather than regex syntax. Actually, to avoid inconsistencies between bash versions, it's best to store the pattern in a variable, then use that (unquoted) in the actual test. See "bash regex with quotes?" Also, \d probably isn't supported (especially inside a bracket expression). — Gordon Davisson
– Gordon Davisson, Commented Aug 25, 2022 at 19:18
Note that condition && action1 || action2 in bash is not a ternary expression so be careful when treating it as one - as written you could get no output even if your regexp comparison succeeded. Whether or not you care probably depends on how likely you think it is that echo "yes" might fail. — Ed Morton
– Ed Morton, Commented Aug 25, 2022 at 20:15

xgord · Accepted Answer · 2022-08-25 20:27:00Z

6

Bash is a simplified version of regex called "Extended Regular Expression". \d doesn't exist in it, so use [0-9] instead.

Additionally, you shouldn't quote the regex in the condition.

[[ $COMMIT_MSG =~ release/(major|minor|patch)/[A-Z0-9]+-[0-9]+ ]] && echo "yes" || echo "no"

edited Aug 25, 2022 at 20:27

answered Aug 25, 2022 at 19:18

xgord

4,8866 gold badges32 silver badges52 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Bash Regex if else

1 Answer 1

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related