Regular Expressions 101

Save & Share

  • Regex Version: ver. 14
  • Update Regex
    ctrl+⇧+s
  • Save new Regex
    ctrl+s
  • Add to Community Library

Flavor

  • PCRE2 (PHP >=7.3)
  • PCRE (PHP <7.3)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java 8
  • .NET 7.0 (C#)
  • Rust
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests

Tools

Sponsors
There are currently no sponsors. Become a sponsor today!
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

@"
"

Test String

Code Generator

Language

Generated Code

import java.util.regex.Matcher; import java.util.regex.Pattern; public class Example { public static void main(String[] args) { final String regex = "(\\d+\\s+Timer.*?PHY Status 0x[01]+ - 0x[01].*?tx_p3a_d1en[\\s]+0[x\\w])+\\s+"; final String string = "000 Timer 0x00000000_0002a465 - 0x00000000_0021453e us: Gen1 - Gen1, DETECT.QUIET - DETECT.QUIET: Status 0x00000030 - 0x00000030: L2R_reason 0x00000000: PHY Status 0x01010000 - 0x01010000\n\n" + " Lane 00:\n\n" + " pga_gain 3, pga_off1 0, pga_off2 1, ph_ofs_t -44,\n\n" + " cdfe_a2 52, cdfe_a3 64, cdfe_a4 118, cdfe_a5 71, cdfe_a6 12, cdfe_a7 124, cdfe_a8 24, cdfe_a9 76, cdfe_a10 49,\n\n" + " zobel_a_gain 12, zobel_b_gain 0, zobel_dc_ofs 260, dc_ofs 25, udfe_thr_0 -152, udfe_thr_1 14, median_amp 179,\n\n" + " cdru_lock_count 0, eh_workaround_stat 0x0, los_toggle_cnt 0x8000, adapt_time 207872, cdr_lock_toggle_cnt 0x3000, jat_stat 0x804d\n\n" + " fs_obs 0, lf_obs 0, pre_cursor 0, cursor 0, post_cursor 0, usp_tx_preset 0x0, dsp_tx_preset 0x0\n\n" + " tx_p1a_d1en 0x30, tx_p1a_d2en 0xf, tx_p1a_amp_red 0x0, tx_p1b_d1en 0x3f, tx_p1b_d2en 0x0, tx_p1b_amp_red 0x0\n\n" + " tx_p2a_d1en 0x3f, tx_p2a_d2en 0x0, tx_p2a_amp_red 0x0, tx_p2b_d1en 0x3f, tx_p2b_d2en 0x0, tx_p2b_amp_red 0x0 tx_p3a_d1en 0x28\n\n" + " Lane 01:\n\n" + " pga_gain 15, pga_off1 24, pga_off2 6, ph_ofs_t -57,\n\n" + " cdfe_a2 -106, cdfe_a3 120, cdfe_a4 -80, cdfe_a5 -31, cdfe_a6 -13, cdfe_a7 127, cdfe_a8 96, cdfe_a9 127, cdfe_a10 4,\n\n" + " zobel_a_gain 0, zobel_b_gain 0, zobel_dc_ofs 457, dc_ofs 217, udfe_thr_0 -215, udfe_thr_1 219, median_amp 176,\n\n" + " cdru_lock_count 0, eh_workaround_stat 0x0, los_toggle_cnt 0x8000, adapt_time 207872, cdr_lock_toggle_cnt 0x3000, jat_stat 0x804d\n\n" + " fs_obs 0, lf_obs 0, pre_cursor 0, cursor 0, post_cursor 0, usp_tx_preset 0x0, dsp_tx_preset 0x0\n\n" + " tx_p1a_d1en 0x30, tx_p1a_d2en 0xf, tx_p1a_amp_red 0x0, tx_p1b_d1en 0x3f, tx_p1b_d2en 0x0, tx_p1b_amp_red 0x0\n\n" + " tx_p2a_d1en 0x3f, tx_p2a_d2en 0x0, tx_p2a_amp_red 0x0, tx_p2b_d1en 0x3f, tx_p2b_d2en 0x0, tx_p2b_amp_red 0x0 tx_p3a_d1en 0x28\n\n"; final Pattern pattern = Pattern.compile(regex); final Matcher matcher = pattern.matcher(string); if (matcher.find()) { System.out.println("Full match: " + matcher.group(0)); for (int i = 1; i <= matcher.groupCount(); i++) { System.out.println("Group " + i + ": " + matcher.group(i)); } } } }

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 Java, please visit: https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html