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A Conditional Expression checks a condition and evaluates its first alternative if the condition is true; otherwise, it evaluates its second alternative.
SyntaxNOTE: The following syntax is an example based on some of the supported engines. For specific engine support, see Engines.
(?(condition)yes-pattern|no-pattern) — Matches yes-pattern if condition is true; otherwise, matches no-pattern.(?(condition)yes-pattern) — Matches yes-pattern if condition is true; otherwise, matches the empty string.The following conditions are supported:
(?(?=test-pattern)…) — Evaluates to true if a lookahead for test-pattern matches; Otherwise, evaluates to false.(?(?!test-pattern)…) — Evaluates to true if a negative lookahead for test-pattern matches; Otherwise, evaluates to false.(?(n)…) — Evaluates to true if the capture group at offset n was successfully matched; Otherwise, evaluates to false.(?(<name>)…) — Evaluates to true if the named capture group with the name name was successfully matched; Otherwise, evaluates to false.(?('name')…) — Evaluates to true if the named capture group with the name name was successfully matched; Otherwise, evaluates to false.(?(R)…) — Evaluates to true if inside a recursive expression; Otherwise, evaluates to false.(?(Rn)…) — Evaluates to true if inside a recursive expression for the capture group at offset n; Otherwise, evaluates to false.(?(R&name)…) — Evaluates to true if inside a recursive expression for the named capture group with the name name; Otherwise, evaluates to false.(?(DEFINE)…) — Always evaluates to false. This allows you to define Subroutines.RetroSearch is an open source project built by @garambo | Open a GitHub Issue
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