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Overview

A number of apps provide advanced features that require the use of regular expressions for pattern matching. Generally, just a simple understanding of regular expressions and a few examples are enough to get by for most use cases. This page has a few simple examples to get started. Use the references for more advanced information. It is recommended to test your regular expressions in one of the well-known regex testing sites such as RegexPlanet or Regex101.

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Info
title

Regex for workflow conditions

For Jira workflow functions using regex expressions to condition whether the post function should continue processing, a blank pattern means that condition processing is not done and processing should continue.

Tip
title

Key tips

  • Dot or period (.) is a special regex character. If you really want to match on it, you need to escape it with a backslash: \.

  • Don't be confused with generic pattern matching used for file systems for instance. On a file system, *.png means all files ending with .png. That is an illegal regex expression. For regex you need: .*\.png, or to simplify: .*png which finds all files ending in png (not necessarily ending in an extension of PNG).

  • Regex is case sensitive by default. In most cases, use the case insensitive flag: (?i). See one of the examples below.

  • Use the Dotall mode to match across line breaks. 

In dotall mode, the expression . matches any character, including a line terminator. By default this expression does not match line terminators. Dotall mode can also be enabled via the embedded flag expression (?s). (The s is a mnemonic for "single-line" mode, which is what this is called in Perl.)

Simple examples

...

autoNumbertrue

Value

Regex

Matches

Demonstrates

ABC

A.C

(tick)

. matches any single character

ABC

A.*

(tick)

...

  • indicates 0 or more characters

ABC

.*C

(tick)

A.B

A\.B

(tick)

Escape special regex characters with backslash if necessary

ABC

AB*

(error)

Regex is NOT generic matching (smile)

ABC

A.+

(tick)

+ indicates 1 or more

ABC

ABC.+

(error)

ABC

ABC.*

(tick)

ABCD

ABC.*

(tick)

ABC

[ABCD]

(tick)

[ ] indicates a class of characters

ABC

[ABZ]

(error)

ABC8

[A-Z0-9]

(tick)

...

  • indicates a range of characters

ABC

[AB^C]

(error)

^ in a class means NOT the following character

ABC

DEF|ABC

(tick)

| indicates OR

image.png

.*png|.*jpg

(tick)

image.jpg

.*png|.*jpg

(tick)

image.JPG

.*png|.*jpg

(error)

defaults to case sensitive matching

image.JPG

(?i).*png|.*jpg

(tick)

(?i) indicates case insensitive matching

ABAB

(AB)+

(tick)

() indicates a grouping

ABCD

(AB)+

(error)

112233

\d+

(tick)

\d for digits

A B

A\s*B

(tick)

\s for whitespace

ABC

\S*

(tick)

\S for non whitespace

\S+

(error)

Value must have at least 1 non whitespace character

A

\S+

(tick)

XYZ,ABC,UVW

.*\bABC\b.*

(tick)

Word boundaries. Finding words in a comma or blank separated list using word boundaries

XYZ,ABCD,UVW

.*\bABC\b.*

(error)

ABC

(?m)(^ABC$)|(^ABC,)|(,ABC,)|(,ABC$)

(tick)

Looking for text matches in a comma separated list by covering all cases: only, start, middle, and end. This uses the multi-line flag: (?m)

XYZ,ABC,UVW

(?m)(^ABC$)|(^ABC,)|(,ABC,)|(,ABC$)

(tick)

XYZ,ABC DEF,UVW

(?m)(^ABC$)|(^ABC,)|(,ABC,)|(,ABC$)

(error)

Advanced examples

Value

Regex

Matches

Find

Demonstrates

example.txt

^((?!\.png).)*$

(error)

(tick)

Find string not containing a word. In this example, files that do not have a .png extension

example.png

^((?!\.png).)*$

(error)

(error)

Find string not containing a word. In this example, files that do not have a .png extension

example.jpeg

(?=^((?!\.png).)*$)(?=^((?!\.jpeg).)*$)

(error)

(error)

Find string not containing a word. In this example, files that do not have a .png or .jpeg extension

collateral wholesale retail

.*(?=.*\bretail\b.*)(?=.*\bcollateral\b.*).*

(tick)


Match exact words anywhere in string. In this case, a blank separated list of labels and both collateral and retail must be included for the match to be successful

wholesale retail

.*(?=.*\bretail\b.*)(?=.*\bcollateral\b.*).*

(error)


Both are required for a match

merger acquisition

.*\b(?:merger|acquisition)\b.*

(tick)


Match string containing either word

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References