Regular Expressions 101

Pro

^start of line

*the literal (32₁₀ / 40₈ / 20₁₆) , repeated any number of times

Group header1(?P<header1>(?:[\u0391-\u03A1\u03A3-\u03A9]+\b(?!\.)(?: +[\u0391-\u03A1\u03A3-\u03A9]+)*\b)?)

Non-Capturing Group(?:[\u0391-\u03A1\u03A3-\u03A9]+\b(?!\.)(?: +[\u0391-\u03A1\u03A3-\u03A9]+)*\b)?

?repeats the group contents below at most once:

Character Class[\u0391-\u03A1\u03A3-\u03A9]+

+matches at least one character from the set below:

\u0391-\u03A1one character from Α (913₁₀) to Ρ (929₁₀) (case sensitive)

\u03A3-\u03A9one character from Σ (931₁₀) to Ω (937₁₀) (case sensitive)

\ba Unicode word boundary

Negative Lookahead(?!\.)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?: +[\u0391-\u03A1\u03A3-\u03A9]+)*

*repeats the group contents below any number of times:

+the literal (32₁₀ / 40₈ / 20₁₆) , repeated at least once

Character Class[\u0391-\u03A1\u03A3-\u03A9]+

+matches at least one character from the set below:

\u0391-\u03A1one character from Α (913₁₀) to Ρ (929₁₀) (case sensitive)

\u03A3-\u03A9one character from Σ (931₁₀) to Ω (937₁₀) (case sensitive)

\ba Unicode word boundary

Non-Capturing Group(?: +(?P<header2>.*))?

?repeats the group contents below at most once:

+the literal (32₁₀ / 40₈ / 20₁₆) , repeated at least once

Group header2(?P<header2>.*)

.*any Unicode character (except for line terminators), repeated any number of times

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

25 tokens

^ *(?P<header1>(?:[\u0391-\u03A1\u03A3-\u03A9]+\b(?!\.)(?: +[\u0391-\u03A1\u03A3-\u03A9]+)*\b)?)(?: +(?P<header2>.*))?

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