Regular Expressions 101

Save & Manage Regex

  • Current Version: 1
  • Save & Share
  • Community Library

Flavor

  • PCRE2 (PHP)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java
  • .NET 7.0 (C#)
  • Rust
  • PCRE (Legacy)
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests
Sponsors
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
Processing...

Test String

Code Generator

Language

Generated Code

import re regex = re.compile(r"^module.(?<module_name>.*)\.(?<module_subname>.*)\.(?<module_item>[a-z|\_|\-|\[|\]|0-9]*[a-z|\.|\[|0-9\]])\:\ (?<action_type>[A-Z|a-z|\ ]*(?<action_status>\.\.\.\ |complete))|\ after\ (?<complete_time>[0-9]*s)|\((?<elapsed_time>[0-9]*s)\ elapsed\)", flags=re.MULTILINE) test_str = ("module.indexer.aws_autoscaling_group.indexer.0: Still creating... (30s elapsed)\n" "module.indexer.aws_autoscaling_group.indexer.2: Still creating... (30s elapsed)\n" "module.indexer.aws_autoscaling_group.indexer.1: Still creating... (30s elapsed)\n" "module.indexer.aws_autoscaling_group.indexer.0: Still creating... (40s elapsed)\n" "module.indexer.aws_autoscaling_group.indexer.2: Still creating... (40s elapsed)\n" "module.indexer.aws_autoscaling_group.indexer.1: Still creating... (40s elapsed)\n" "module.cluster_master.aws_autoscaling_group.cluster_master: Creation complete after 40s (ID: sre-sandbox - cluster-master)\n" "module.sh1.aws_autoscaling_group.search_head: Creation complete after 40s (ID: sh1 - sre-sandbox - search-head)\n" "module.cluster_master.aws_autoscaling_group.cluster_master: Creation complete after 40s (ID: sre-sandbox - cluster-master)\n" "module.sh1.aws_autoscaling_group.search_head: Creation complete after 40s (ID: sh1 - sre-sandbox - search-head)\n" "module.indexer.aws_autoscaling_group.indexer[0]: Creation complete after 41s (ID: sre-sandbox - indexer - subnet-78aba033)\n" "module.indexer.aws_autoscaling_group.indexer[1]: Creation complete after 41s (ID: sre-sandbox - indexer - subnet-08397f55)\n" "module.kms_key.aws_kms_key.stack_key: Destruction complete after 22s\n" "module.iam_profile.aws_iam_role.stack_iam_role: Destruction complete after 1s\n" "module.indexer.null_resource.indexer_asg[1]: Destruction complete after 0s\n" "module.indexer.null_resource.indexer_asg[2]: Destruction complete after 0s\n" "module.security_groups.aws_security_group_rule.public_search_head_vault: Destruction complete after 1s\n" "module.security_groups.aws_security_group_rule.private_sg_self_rule_out[2]: Destruction complete after 1s\n" "module.security_groups.aws_security_group_rule.private_sg_ldap_outbound[0]: Destroying... (ID: sgrule-1706144597)\n" "module.indexer.aws_autoscaling_attachment.hec[1]: Destroying... (ID: sre-sandbox - indexer - subnet-08397f55-20190901000149529200000006)\n" "module.security_groups.aws_security_group_rule.private_sg_port443: Destroying... (ID: sgrule-2181904703)\n" "module.security_groups.aws_security_group_rule.private_sg_self_rule_out[3]: Destruction complete after 1s\n" "module.indexer.aws_ssm_parameter.facts: Destroying... (ID: /dev/facts/stack/sre-sandbox/indexer)\n" "module.indexer.dyn_node.inputs-dns[4]: Destruction complete after 6s\n" "module.security_groups.aws_security_group_rule.indexer_self[1]: Destroying... (ID: sgrule-2553743418)\n" "module.indexer.aws_ssm_parameter.facts: Destruction complete after 0s\n" "module.indexer.aws_autoscaling_attachment.hec[1]: Destruction complete after 1s \n" "module.security_groups.aws_security_group_rule.private_sg_self_rule[0]: Destroying... (ID: sgrule-262603171)\n" "module.sh1.aws_autoscaling_group.search_head: Destroying... (ID: sh1 - sre-sandbox - search-head)\n") matches = regex.finditer(test_str) for match_num, match in enumerate(matches, start=1): print(f"Match {match_num} was found at {match.start()}-{match.end()}: {match.group()}") for group_num, group in enumerate(match.groups(), start=1): print(f"Group {group_num} found at {match.start(group_num)}-{match.end(group_num)}: {group}")

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 Python, please visit: https://docs.python.org/3/library/re.html