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

r"
"
gmx

Test String

Code Generator

Language

Generated Code

use strict; my $str = 'Started by upstream project "run_script" build number 435 originally caused by: Started by user test [Pipeline] { [Pipeline] stage (Svnup) Entering stage Svnup + python -m test.cli install 479CI9SOZ android://0.0.0.0:10000/479CI9SOZ /root/workspace/group/apk/com.data.app.apk - - false false [03:21:33][DEBUG]<android> /root/env/common/test/test/core/android/adb/linux/adb -H 0.0.0.0 -P 10000 -s 479CI9SOZ wait-for-device Traceback (most recent call last): File "/usr/lib/python2.7/runpy.py", line 174, in _run_module_as_main "__main__", fname, loader, pkg_name) File "/usr/lib/python2.7/runpy.py", line 72, in _run_code exec code in run_globals File "/root/env/common/test/test/cli/parser.py", line 55, in main run_script(args) File "/root/env/common/test/test/core/helper.py", line 224, in wrapper return f(pictarget, *args[1:], **opargs) File "/root/env/common/test/test/core/main.py", line 408, in assert_exists raise AssertionTimeout("%s does not exist in screen" % v) AssertionTimeout: MoaPic(group_login.owl/tpl1487844291185.png) does not exist in screen EndOfStream [03:23:18][DEBUG]<android> /root/env/common/test/test/core/android/adb/linux/adb -H 0.0.0.0 -P 10000 -s 479CI9SOZ forward --remove tcp:12671 + python -m test.cli run 479CI9SOZ android://0.0.0.0:10000/479CI9SOZ /root/workspace/group/util/scripts/group_login.owl rpc_uri: http://0.0.0.0:12708/jsonrpc/0 rpc_uri: http://0.0.0.0:12708/jsonrpc/0 Traceback (most recent call last): File "/usr/lib/python2.7/runpy.py", line 174, in _run_module_as_main "__main__", fname, loader, pkg_name) File "/usr/lib/python2.7/runpy.py", line 72, in _run_code exec code in run_globals File "/root/env/common/test/test/__main__.py", line 5, in <module> main() File "/root/env/common/test/test/cli/parser.py", line 55, in main run_script(args) File "/root/env/common/test/test/cli/runner.py", line 124, in run_script exec_script(args.script, scope=globals(), root=True) File "/root/env/common/test/test/cli/runner.py", line 186, in exec_script exec(compile(code, scriptpath, \'exec\')) in scope File "/root/env/common/mator/mator/mator.py", line 520, in start raise IOError("RPC server not started!") IOError: RPC server not started! [03:24:40][DEBUG]<android> /root/env/common/test/test/core/android/adb/linux/adb -H 0.0.0.0 -P 10000 -s 479CI9SOZ forward --remove tcp:12708 [03:26:41][DEBUG]<main> ->sift result: None [03:26:41][DEBUG]<main> match result: None Traceback (most recent call last): File "/usr/lib/python2.7/runpy.py", line 174, in _run_module_as_main "__main__", fname, loader, pkg_name) File "/usr/lib/python2.7/runpy.py", line 72, in _run_code exec code in run_globals File "/root/env/common/test/test/core/main.py", line 195, in touch pos = loop_find(v, timeout=timeout) File "/root/env/common/test/test/core/utils/logwraper.py", line 70, in wrapper res = f(*args, **kwargs) File "/root/env/common/test/test/core/cv.py", line 83, in loop_find raise NotFoundException(\'Picture %s not found in screen\' % query) test.core.error.NotFoundException: \'Picture MoaPic(group_login.owl/tpl1482311722698.png) not found in screen\' + python -m test.cli stop_screen_record android://0.0.0.0:10000/479CI9SOZ 479CI9SOZ.mp4 ERROR: script returned exit code 1 Finished: FAILURE'; my $regex = qr/^Traceback [\s\S]+? (?=^\[|\Z)/mxp; if ( $str =~ /$regex/g ) { print "Whole match is ${^MATCH} and its start/end positions can be obtained via \$-[0] and \$+[0]\n"; # print "Capture Group 1 is $1 and its start/end positions can be obtained via \$-[1] and \$+[1]\n"; # print "Capture Group 2 is $2 ... and so on\n"; } # ${^POSTMATCH} and ${^PREMATCH} are also available with the use of '/p' # Named capture groups can be called via $+{name}

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