Regular Expressions 101

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An explanation of your regex will be automatically generated as you type.
Detailed match information will be displayed here automatically.
  • All Tokens
  • Common Tokens
  • General Tokens
  • Anchors
  • Meta Sequences
  • Quantifiers
  • Group Constructs
  • Character Classes
  • Flags/Modifiers
  • Substitution
  • A single character of: a, b or c
    [abc]
  • A character except: a, b or c
    [^abc]
  • A character in the range: a-z
    [a-z]
  • A character not in the range: a-z
    [^a-z]
  • A character in the range: a-z or A-Z
    [a-zA-Z]
  • Any single character
    .
  • Alternate - match either a or b
    a|b
  • Any whitespace character
    \s
  • Any non-whitespace character
    \S
  • Any digit
    \d
  • Any non-digit
    \D
  • Any word character
    \w
  • Any non-word character
    \W
  • Non-capturing group
    (?:...)
  • Capturing group
    (...)
  • Zero or one of a
    a?
  • Zero or more of a
    a*
  • One or more of a
    a+
  • Exactly 3 of a
    a{3}
  • 3 or more of a
    a{3,}
  • Between 3 and 6 of a
    a{3,6}
  • Start of string
    ^
  • End of string
    $
  • A word boundary
    \b
  • Non-word boundary
    \B

Regular Expression
No Match

/
/
gm

Test String

Substitution

Processing...

Code Generator

Language

Generated Code

use strict; my $str = 'demo, demo-setga, Deployment (apps) has changed: ... - image: "imagedemo43" + image: "imagedemo44" ... demo, demo-app1, Deployment (apps) has been removed: - # Source: /charts/app1/templates/deploy.yaml - apiVersion: apps/v1 - imagePullSecrets: - - name: demo-registry + demo, demo-app2, Deployment (apps) has changed: ... - value: 4.2.0 + value: 4.3.0 ... demo, demo-app4, Deployment (apps) has been added: - + apiVersion: apps/v1 + kind: Deployment + metadata: + heritage: Helm + imagePullSecrets: + - name: demo-registry demo, demo-app9, Deployment (apps) has changed: ... - value: 2.2.0 + value: 4.3.0 ... demo, demo-app5, PodDisruptionBudget (policy) has been added: - + apiVersion: policy/v1beta1 + kind: PodDisruptionBudget + metadata: + app: app5 + release: demo ../helm_var/test/dev/secrets.yaml.dec demo, demo-app8, PodDisruptionBudget (policy) has been added: - + # Source: test/charts/app5/templates/pdb.yaml + apiVersion: policy/v1beta1 + matchLabels: + app: app5 + release: demo demo, demo-app9, Deployment (apps) has changed: ... - value: 4.1.0 + value: 9.3.0 ...'; my $regex = qr/^.*added:[\s\S]*?(?=^[^+-])/mp; my $subst = ''; my $result = $str =~ s/$regex/$subst/rg; print "The result of the substitution is' $result\n";

Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Perl, please visit: http://perldoc.perl.org/perlre.html